AVRCP Controller State without Browsing

Some devices do not support Browsing over AVRCP and the playback state
of those devices was inconsistent on disconnection of the Control
channel.  This change improves the consistency of the data reported via
the media_session.

Bug: 144013853
Test: atest AvrcpControllerStateMachineTest
Change-Id: I3ce26d76a81422d1e5af8b439d8bc1ab30d320dc