Bluetooth App changes to support for 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: I3d2a87d7c876f6d2a166f4a823c1991be76758fd
(cherry picked from commit c0a60d5fff4ebc16cd47a59f327ea133864af2c0)
(cherry picked from commit da031e006f002c4a43cfdceb1c707f1d412194cd)
(cherry picked from commit 9f663f518be967da31aa115487d47e37513889d6)