Add ACTION_STOP as a default player supported action

Bug: b/128611379
Test: adb shell input keyevent MEDIA_STOP, make sure AVRCP is routed the
key event and fires its onStop() function, passing the event to the
remote device.

Change-Id: Ie4c483e284e145655a44727daa75a9b11fbe0df0
1 file changed