Bluetooth: controller: Fixes for CIS Central error handling

- Fix masking for no coded phy
- Allow ISO_Interval < SDU_Interval for framed mode
- Change BT_HCI_ERR_INSUFFICIENT_RESOURCES to
  BT_HCI_ERR_CONN_LIMIT_EXCEEDED.
- Prevent starting same CIS twice
- Cancel an initiated CIS creation procedure if terminated before
  sending CIS_IND.
- Implement canceling of local CC procedure. Respond to CIS_RSP with
  REJECT, if canceled after CIS_REQ was sent.
- Introduce state CIG_STATE_INITIATING for central, to keep track of
  initiating CIS connection, in transition between CONFIGURABLE and
  ACTIVE.

Fixes EBQ test /HCI/CIS/BC-03-C.

Signed-off-by: Morten Priess <mtpr@oticon.com>