hal: restore a2dp during soft hand-off

During bt playback if a2dp is not ready and playback is
muted over speaker and if we do a SHO, audio remains mute
and not restored

Add condition to check if a2dp is muted and restore a2dp

Change-Id: If3a52bc2ffaa1063d29d28e7023c5dee742a94a0
1 file changed