[LE Audio] Deregister notif when ccc fail of CSIS

Currently when ccc failed for csis, we did not deregister
as what LEA client did, provide this logic. Also, improve
the logging for ccc registration to better know which
device is done.

Bug: 298599400
Test: manual
Test: atest -c bluetooth_le_audio_client_test bluetooth_vc_test bluetooth_csis_test
Change-Id: I4aa1ac7d1593ea85b6e2265590fe2f727c88373f