Merge net branch into master

Main changes:

- MQTT compiler warning fix.
- Fixes to NXP MCR20A driver for IEEE 802.15.4.
- Link (MAC) short address fixes for IEEE 802.15.4.
- TCP memory leak fixes.
- SLIP fixes.
- More fixes to build errors in net when using ISSM's llvm/icx
  compiler.
- Added Nordic IEEE 802.15.4 driver for nrf5.

----------------------------------------------------------------
Flavio Santes (1):
      tests/mqtt: Fix compiler warnings in MQTT Packet test case

Johann Fischer (1):
      drivers: mcr20a: cleanup and refactor interrupt processing

Jukka Rissanen (6):
      net: Add network link technology type to linkaddr
      net: Set the network link address type when setting link address
      net: nbuf: Set the link address type in nbuf
      net: ipv6: IEEE 802.15.4 short address fix
      net: buf: net_buf_frag_del() had insufficient debugging
      drivers/ieee802154/pipe: Use net_nbuf_unref to release net_buf

Michael Scott (1):
      net: context: let tcp_established() handle more TCP states

Ravi kumar Veeramally (5):
      net: context: Fix invalid order of statements
      drivers: slip: Remove unused variables
      drivers: slip: Add more comments for slip write scenario
      drivers: slip: Skip buffer allocation for incomplete packet
      net: tcp: Retransmit buffers are not freed on tcp_release

Tomasz Bursztyka (2):
      net: Fix stack type
      net/utils: Fix parameters type

Wojciech Bober (5):
      ext: Import Nordic 802.15.4 radio driver
      ext: Integrate Nordic's 802.15.4 radio driver into Zephyr
      drivers/net/ieee802154: nRF5 802.15.4 radio driver
      samples/net: ieee802154: Add configuration for nrf5
      samples/net/ieee802154: Update example with nrf5 802.15.4

 drivers/ethernet/eth_enc28j60.c                    |    3 +-
 drivers/ethernet/eth_mcux.c                        |    3 +-
 drivers/ethernet/eth_sam_gmac.c                    |    3 +-
 drivers/ieee802154/Kconfig                         |    2 +
 drivers/ieee802154/Kconfig.nrf5                    |   72 +
 drivers/ieee802154/Makefile                        |    1 +
 drivers/ieee802154/ieee802154_cc2520.c             |    2 +-
 drivers/ieee802154/ieee802154_mcr20a.c             |  693 ++++----
 drivers/ieee802154/ieee802154_mcr20a.h             |    6 +-
 drivers/ieee802154/ieee802154_nrf5.c               |  411 +++++
 drivers/ieee802154/ieee802154_nrf5.h               |   59 +
 drivers/ieee802154/ieee802154_uart_pipe.c          |    4 +-
 drivers/slip/slip.c                                |   79 +-
 ext/hal/Kbuild                                     |    1 +
 ext/hal/nordic/Kconfig                             |    6 +-
 ext/hal/nordic/Makefile                            |    4 +
 ext/hal/nordic/drivers/Kbuild                      |   33 +
 ext/hal/nordic/drivers/Makefile                    |    3 +
 ext/hal/nordic/drivers/README.md                   |  128 ++
 ext/hal/nordic/drivers/nrf_drv_radio802154.c       | 1649 ++++++++++++++++++++
 ext/hal/nordic/drivers/nrf_drv_radio802154.h       |  348 +++++
 include/net/buf.h                                  |    8 +
 include/net/nbuf.h                                 |    9 +
 include/net/net_core.h                             |    2 +-
 include/net/net_if.h                               |    5 +-
 include/net/net_ip.h                               |   23 +-
 include/net/net_linkaddr.h                         |   20 +
 samples/net/echo_client/prj_nrf5.conf              |   55 +
 samples/net/echo_server/prj_nrf5.conf              |   54 +
 samples/net/ieee802154/hw/prj_nrf5.conf            |   50 +
 samples/net/ieee802154/hw/src/ieee802154_test.c    |    4 +
 subsys/net/buf.c                                   |   11 +
 subsys/net/ip/l2/bluetooth.c                       |    6 +-
 subsys/net/ip/l2/dummy.c                           |    2 +
 subsys/net/ip/l2/ethernet.c                        |    2 +
 subsys/net/ip/l2/ieee802154/ieee802154.c           |    2 +
 subsys/net/ip/net_context.c                        |    6 +-
 subsys/net/ip/tcp.c                                |    8 +
 subsys/net/ip/utils.c                              |    4 +-
 tests/net/6lo/src/main.c                           |    2 +-
 tests/net/arp/src/main.c                           |    2 +-
 tests/net/context/src/main.c                       |    3 +-
 tests/net/dhcpv4/src/main.c                        |    2 +-
 tests/net/ieee802154/fragment/src/main.c           |    2 +-
 .../net/ieee802154/l2/src/ieee802154_fake_driver.c |    2 +-
 tests/net/iface/src/main.c                         |    3 +-
 tests/net/ip-addr/src/main.c                       |    2 +-
 tests/net/ipv6/src/main.c                          |    3 +-
 tests/net/lib/mqtt_packet/src/mqtt_packet.c        |   34 +-
 tests/net/mgmt/src/mgmt.c                          |    2 +-
 tests/net/route/src/main.c                         |    3 +-
 tests/net/rpl/src/main.c                           |    3 +-
 tests/net/tcp/src/main.c                           |    2 +-
 tests/net/udp/src/main.c                           |    2 +-
 54 files changed, 3406 insertions(+), 442 deletions(-)
 create mode 100644 drivers/ieee802154/Kconfig.nrf5
 create mode 100644 drivers/ieee802154/ieee802154_nrf5.c
 create mode 100644 drivers/ieee802154/ieee802154_nrf5.h
 create mode 100644 ext/hal/nordic/drivers/Kbuild
 create mode 100644 ext/hal/nordic/drivers/Makefile
 create mode 100644 ext/hal/nordic/drivers/README.md
 create mode 100644 ext/hal/nordic/drivers/nrf_drv_radio802154.c
 create mode 100644 ext/hal/nordic/drivers/nrf_drv_radio802154.h
 create mode 100644 samples/net/echo_client/prj_nrf5.conf
 create mode 100644 samples/net/echo_server/prj_nrf5.conf
 create mode 100644 samples/net/ieee802154/hw/prj_nrf5.conf

Change-Id: I727a2f97fbb7f443a5f947bb4ca7e4274695737b
Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>