AVRCP: set addressed player on key dispatch

MediaSessionManager.Callback.onAddressedPlayerChanged isn't being called
consistently when the package that receives media keys changes.

This affects media metadata showing up because the addressed player
controls the mMediaController.

Update the addressed player for every media key press as a workaround.

Adjust logging to reduce logspam.

Test: connect to carkit, play from GPM then switch to Youtube.
Bug: 37789858
Bug: 34471252
Bug: 37998705
Bug: 37865298
Change-Id: Ic94bb97d51f48f9799edfca0d5f9a9b2872b0132
(cherry picked from commit 78d53f7d)
(cherry picked from commit 0c3b4f4f)