Merge "Add mutex and callback check on a2dp sink interface" am: a368b00f am: 905eb020

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



Change-Id: I004d71c81d2dc422b5ef177379849f0ad436e2b0
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>