Merge "Add mutex and callback check on a2dp sink interface" am: a368b00f

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Bluetooth/+/2410780



Change-Id: I6bf3c8c9adc207a92808c21286cde777a57ec226
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>