mm-video: vidc: Missing release of pending input buffers to client

For unsupported contents with codec config buffer flag set, input
buffers in the pending queue are not released back to client
after FLUSH causing native crash. This change ensures that buffers
are released properly during flush.

Change-Id: I88c8f0db6fe40e6920a47b2983427f7927648f87
CRs-Fixed: 640296
1 file changed