Merge changes from topic "convergence_sdp_serialization"

* changes:
  SDP: split the sdpu_process_pend_ccb
  SDP Use reference instead of int / pointer
  SDP code cleanup duplication
  SDP: TEST Handle race condition in HID SDP
  SDP: Handle race condition in HID SDP
  SDP: TEST Serialize sdp connections from profiles
  SDP: Serialize sdp connections from profiles/BT APP
  Prepare SDP for convergence