Update RemoteController info when enabling/disabling it

When a RemoteController listener is disabled: send its listener
 "blank" information (no artist, "stopped state"...)
When a RemoteController listener is enabled: have the current
 RemoteControlClient send the current information.

Bug 8209392

Change-Id: I375bf3c42a425ada94c61453b51669d7e819dde4
2 files changed