MediaSessionRecord: protect adjustVolume from SecurityException

Take into account that all methods that end up calling
  AudioService.adjustStreamVolume(...) can throw a
  SecurityException when the caller doesn't have the right
  permission to change the DnD mode.

Bug: 110525559
Test: none yet
Change-Id: I4622a07ea8be2ce03fb9732796a08f671a17b45d