AVRCP Controller transient loss while idle

While gaining and losing focus due to transient focus requests ensure
Bluetooth restores to the correct playback state.  This corrects issues
that could arise during non media sonification durring a transient
focus loss.

Bug: 136092891
Test: atest com.android.bluetooth.a2dpsink.A2dpSinkStreamHandlerTest
Merged-In: I58997b3b8b96da309ff4c31a2b3039dccf9b3578
(cherry picked from commit 32d3d5acac7eabd2bd00be46ea9e399a8b8db10b)

Change-Id: If21c7a631c084ed1bc450d58cf3618cc1672699a
3 files changed