floss: avrcp: refactor the AVRCP topshim interface

Minor refactor the AVRCP topshim interface to utilize DeviceConnected,
and DeviceDisconnected naming conventions as more AVRCP functionalities
will start to depend on the device connection state. Pass in the
address info for AVRCP callbacks.

Bug: 240780817
Tag: #floss
Test: ./build.py

Change-Id: Idfd9075609b35620555bfa113cfd21cd77d1fa75