SDP: Clean up CCBs when L2CAP disconnects

If upper requests SDP disconnect via a CCB that is in state
CONN_PEND and has a valid CID, then after disconnecting L2CAP we
need to clean up originating CCB for CID in addition to all the
pending CCBs.

Bug: 396856351
Bug: 413457570
Flag: com.android.bluetooth.flags.sdp_ccb_clean_up_after_l2cap_disc
Test: atest net_test_stack_sdp
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:0e45ce1dc53e611da84344e7c5a11108ad7dba46)
Merged-In: I77fd1971291111aedff5fca2b6d70518c99c28bb
Change-Id: I77fd1971291111aedff5fca2b6d70518c99c28bb