l2cap: add missing reject error codes

l2cap: extract l2cap_cbm_run_channel

l2cap: check can send now for all cbm states

l2cap: announce support for security manager only if CTKD and LE are enabled

l2cap: make l2cap_get_remote_mtu_for_local_cid available to LE-only builds

l2cap: fix ecbm service registration

l2cap: reject disconnect request for invalid cids

l2cap: reject ecbm channel if remote cid already exists

l2cap: handle authorization requirement in ecbm

l2cap: add authorization_required param to ecbm service registration

l2cap: add l2cap_ecbm_trigger_pending_connection_responses

l2cap: send ecbm pending if authentication possible

l2cap: extract l2cap_ecbm_security_status_for_connection_request

l2cap: send ecbm pending if authentication possible

l2cap: prepare l2cap_handle_security_level for multiple iterations

l2cap: extract l2cap_ecbm_handle_security_level_incoming_sufficient

l2cap: extract l2cap_ecbm_emit_incoming_connection

l2cap: rework ecbm security checks

l2cap: disconnect if fragment larger than local mps is received

l2cap: store local_mps for credit-based channels in l2cap_channel_t

l2cap: disonnect cbm/ecbm if packet with sdu larger than mtu is received

l2cap: return 'ecbm all refused insufficient encryption' if encryption required but unencrypted

l2cap: reject incoming connection with security block in SC-only mode if non-SC connection

l2cap: send L2CAP_EVENT_ECBM_CHANNEL_OPENED after accept/decline connections

l2cap: use defines for official channel ids