AVRCP Controller media session queue

Add support for the Now Playing Content available through AVRCP to
receive proper notifications when it changes and expose it via media
session rather than a node in the browse tree.

Bug: 78598689
Test: Stream Music, change songs and playlist, verify media session
queue.

Change-Id: I56ff96c51a007cc91e5ca94ed26e0a213bf6b6da