AVRCP: synchronize with better granularity

Make synchronization more granular by synchronizing on the objects
actually being used.

Fix missing synchronization on mMediaPlayerInfoList.

Test: basic smoke test with multiple players
Change-Id: Iec451dca2c51ec6f6f35a1d0a28f2c4dd52db722
Fixes: 37651901
1 file changed
tree: 07d405f4bdfad27f486a622f654b647daf89d7b8
  1. android/