libHardware changes to support Avrcp1.5

Provide support for Avrcp1.5 so that remote CT is able to
browse the list of available media players on DUT and select the
media player from the available list of players, from remote.

Change-Id: Ib804efc3a42d14f302d0d1eec7ab34c9f13b5c7d
(cherry picked from commit 930dea418889c07a9ee3e6cfba3a57f7ef79df9f)
(cherry picked from commit 611745ca017c72079d4a3e7a2f7e953cd00350d5)
(cherry picked from commit 169a7fa2f35e68b5cc9a3f924a94b05a01b18614)