floss: avrcp: handle set active device request from AVRCP interface

Handle the much less frequent case that AVRCP was connected alone or
before A2DP profile and the set specific device to active request comes
directly from the AVRCP interface. Propagate such request to uinput
when received.

Bug: 240780817
Tag: #floss
Test: emerge-${BOARD} floss
Change-Id: Ice0807b6a01ac9bcf6f3783d63931881b47e480c