AVRCP: Fix for abrupt volume increase/decrease from DUT

If there is abrupt increase/decrease of volume from DUT
in form of quick Volume up/down OR dragging the volume
bar on DUT sometimes ends of sending older volume value
based on Remote's responsiveness of SetVolume commands
which gets queued up. Hence, cache the last latest value
of volume and send at last to send correct volume value.

Change-Id: Id6fa4505da5409323f1c1ea1e97e52239e31c6a2
1 file changed