AVRCP Controller browsing disconnect status

When an AVRCP browsing source disconnects, be sure to update the
playback state with an appropriate error message.

Test: dumpsys media_session
Bug: 131620323
Change-Id: Ibf1500d8f01af7aa1f603453be0920a8284c5805
Merged-In: Ibf1500d8f01af7aa1f603453be0920a8284c5805