Merge bluetooth branch into master

 - newlib related fixes for the AT parser
 - Channel Selection Algorithm #2 support (Bluetooth 5.0 feature)
 - Better tracking of outgoing data (with callback support)
 - Various smaller cleanups & fixes

----------------------------------------------------------------
Carles Cufi (3):
      Bluetooth: HCI: Add Bluetooth 5.0 LE commands and events
      Bluetooth: HCI: Naming consistency tweaks
      Bluetooth: Use event masks instead of bits in controller and host

Johan Hedberg (8):
      Bluetooth: hci_raw: Fix ECC support
      Bluetooth: Add support for tracking transmitted packets
      Bluetooth: ATT: Enforce flow for incoming requests & indications
      Bluetooth: SMP: Track when last key distribution PDU has been sent
      Bluetooth: Introduce a timeout for synchronous HCI command sending
      Bluetooth: ATT: Fix bogus CONTAINER_OF() usage
      Bluetooth: Introduce flow control for outgoing ATT packets
      Bluetooth: ATT: Start response timer only after actual transmission

Kumar Gala (3):
      Bluetooth: AT: use explicit unsigned char to avoid array subscript error
      Bluetooth: AT: Fix building with newlib
      Bluetooth: AT: Unit: Fixup include search path

Luiz Augusto von Dentz (4):
      Bluetooth: ipsp: Add TX pools for TCP
      Bluetooth: L2CAP: Try to allocate segment from the original pool
      net: buf: Add net_buf_reset
      Bluetooth: L2CAP: Reuse request buffer to respond

Vinayak Chettimada (5):
      Bluetooth: controller: Rename channel/chnl to chan
      Bluetooth: HCI: Add Bluetooth 5.0 FeatureSet field's bit mapping
      Bluetooth: Fix missing LE conn param req bit in set LE evt mask
      Bluetooth: controller: Support BT 5.0 feature set bit fields
      Bluetooth: controller: Channel Selection Algorithm #2

 include/bluetooth/hci.h                           | 495 +++++++++++++++--
 include/bluetooth/l2cap.h                         |   2 +-
 include/net/buf.h                                 |   9 +
 samples/bluetooth/ipsp/src/main.c                 |  15 +
 subsys/bluetooth/controller/Kconfig               |   7 +
 subsys/bluetooth/controller/hal/nrf5/radio.c      |   4 +-
 subsys/bluetooth/controller/hal/radio.h           |   2 +-
 subsys/bluetooth/controller/hci/hci.c             |  95 ++--
 subsys/bluetooth/controller/ll_sw/ctrl.c          | 622 ++++++++++++++++------
 subsys/bluetooth/controller/ll_sw/ctrl.h          |  71 ++-
 subsys/bluetooth/controller/ll_sw/ctrl_internal.h |  25 +-
 subsys/bluetooth/controller/ll_sw/ll.c            |  24 +-
 subsys/bluetooth/controller/ll_sw/pdu.h           |  12 +-
 subsys/bluetooth/host/Kconfig                     |  31 ++
 subsys/bluetooth/host/at.c                        |   2 +-
 subsys/bluetooth/host/at.h                        |   2 +-
 subsys/bluetooth/host/att.c                       | 230 ++++++--
 subsys/bluetooth/host/conn.c                      | 111 +++-
 subsys/bluetooth/host/conn_internal.h             |  23 +-
 subsys/bluetooth/host/hci_core.c                  | 163 +++---
 subsys/bluetooth/host/hci_core.h                  |   3 +-
 subsys/bluetooth/host/hci_ecc.c                   |   2 +-
 subsys/bluetooth/host/hci_raw.c                   |   4 +
 subsys/bluetooth/host/hfp_hf.c                    |   2 +
 subsys/bluetooth/host/l2cap.c                     |  79 ++-
 subsys/bluetooth/host/l2cap_internal.h            |  12 +-
 subsys/bluetooth/host/sdp.c                       |   2 +
 subsys/bluetooth/host/smp.c                       | 117 +++-
 subsys/net/buf.c                                  |  12 +-
 tests/bluetooth/init/prj_controller_4_0.conf      |   1 +
 tests/unit/bluetooth/at/src/Makefile              |   2 +-
 tests/unit/bluetooth/at/src/main.c                |   2 +-
 32 files changed, 1695 insertions(+), 488 deletions(-)

Change-Id: I17f9e49e1347a38bc78be3bdcaa596e41d83da56
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>