sm: moved sm_encryption_key_size, sm_authenticated, sm_authorization_state into gap.h

l2cap: use log_debug for le data channel feedback

l2cap: fix parsing of CONNECTION_PARAMETER_UPDATE_REQUEST

l2cap-ertm: indicate support for FCS Option in Information Response

l2cap-ertm: remove dead code

l2cap-ertm: calculate fcs only if used

l2cap-ertm: fix fcs option configuration

l2cap-ertm: add mtu option to ertm config request/response

l2cap: assume remote mtu = L2CAP_DEFAULT_MTU (instead of L2CAP_MINIMAL_MTU) if peer doesn't send MTU config option

l2cap: support connection requests during connection request failure

l2cap: fix for fixed channel round robin

l2cap-ertm: try to negotiate 'No FCS' in order to work around iOS bug

Issue: iOS (e.g. 10.2) uses 'No FCS' as default while Core 5.0 specifies 'FCS' as default
Workaround: try to actively negotiate

l2cap-ertm: try to negotiate 'No FCS' in order to work around iOS bug

Issue: iOS (e.g. 10.2) uses 'No FCS' as default while Core 5.0 specifies 'FCS' as default
Workaround: try to actively negotiate 'No FCS' and fall back to 'FCS' if 'No FCS' is rejected
This works as iOS accepts the 'No FCS' request, hence the default value is only used on non-iOS devices

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l2cap: round robin for fixed channel send requests

l2cap-ertm: fix compile

l2cap-ertm: assert incoming ertm data is <= local MTU and check for buffer overrun during reassemblt

l2cap-ertm: assert ertm SDUs contains Control + FCS fields and are smaller or equal local_mps

l2cap-ertm: fix setup of outgoing ertm tx buffers

l2cap-ertm: use min(local,remote) in config response for TxWindow and MPS

l2cap: limit mtu in conf resp to remote mtu - regression from 6dca2a0c

l2cap: seperate l2cap_setup_options for request and response

l2cap: fix regression in LE Signaling Len check for Connection Update Request/Response in adcfabadef2147ecee52ccbc9ab695b6df44e568

l2cap: fix -Wvarargs warnings from clang 9.0

l2cap: fix compile

l2cap: fix compile

l2cap: remove unused arguments, annotate all UNUSED