BT: Converging AVRCP files for multi-connection FR

Converging AVRCP files at under single project.
These files are required for compatibility with QTI stack
and will contain changes to support multi AVRCP connections.

CRs-Fixed: 2445228
Change-Id: Ia4e9610efc1763c3d1e9e57c5a4bb322a8116f13
6 files changed