msm: camera: Cleanup the buffers before stream close

Need to release all the buffers enqueued to the
driver when stream is turned off or stream is closed.
This ensures the proper clean up of stream queues
avoiding any stale entries in the queues.

Change-Id: Ic967ce61236f2e170aa8f4b4f861cb0677b082a3
Signed-off-by: Lakshmi Narayana Kalavala <lkalaval@codeaurora.org>