Return bool in AVRCP Controller API

If a feature is not supported then instead of timing out the return
value from the API can lead to a quicker UI experience.

Bug: b/31754876
Change-Id: I4f23700a5318c9b98e3c464f18f73a3ac41fbfcd
(cherry picked from commit 814454d2fd22a7be6fe535ff26986f8a6f6db2a7)