AVRCP controller browse

onConnect and disconnect update the player list

Bug: 62105073
Test: 1 disconnect bluetooth, check the player list
      2 connect bluetooth, check the player list, kill bluetooth audio
      app and repeat

Change-Id: I27ea0eaebd90bddc952fc6445697796897d7cf07
Merged-In: I5a0ed5a3d8f02911d2077d9d99b427eeaddf4dbd
(cherry picked from commit 01bd404e)