libstagefirght: Fix for music skip in LPA A2DP case

-Portion of music repeating twice after disconnecting and
 connecting A2DP
-When A2DP disconnects, timeplayed will be updated with the data
 sent to A2DP. But Decoder thread already has some decoded data
 which is not sent to A2DP.Here if A2DP connects back decoder
 thread calls fillbuffer with the  time played position.
 Because of this fillbuffer getting some of the decoded data
 which is already decoded earlier.
-To address this issue when the A2DP disconnect and connect happens
 clearing all the buffer which are there in response queue.

CRs-Fixed: 356571
(cherry picked from commit b52619bdc157646278fce30ceb84057370f030c1)

Conflicts:

	media/libstagefright/LPAPlayer.cpp

Change-Id: I98578d4470021757625ad1203682da4bb45cd055