Allow privileged app to set media key event listener

If the media key listener is set, the listener will receive the media key
events before any other sessions, but after the global priority session.
If the event is handled by the listener, other sessions cannot get the event.

Privileged app needs permission android.permission.SET_MEDIA_KEY_LISTENER
to set the listener.

Bug: 30125811
Change-Id: I2b2cf4ac7873b70899194701c6921990dcb9de02