Merge "bass_client: Add notifySourceFound and fix NPE" into tm-dev am: 0937c613 am: ecbc8823

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/Bluetooth/+/18028790



Change-Id: I9394b29dd78221f69b419f77f586214214564b70
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>