AVRCP: Ignore unpaired keyevent for fastforward/rewind

Some headset will send rewind/fastforward button release command
before the backward/forward passthrough command.It will caused some
player enter pause state. Add record for the key press state of
rewind/fastforward keyevent, Ingnor the keyevent if it has no paired
keyevent before.

CRs-Fixed: 2215720
Change-Id: Ic1c16495a4c66a2fe4b8d31c3eaaf591e49accdc
1 file changed