Merge "Support sending KEYCODE_HEADSETHOOK KeyEvent from an a11y service" into rvc-dev am: fdea871287 am: 281b51f4a8 am: ba7a4d28b1 am: 17ef90b6e6 am: c8cac0cff9

Change-Id: I84b8930bbf63779dfeb10090861a1c62099b1dc0