mm-video-v4l2: vdec: streamoff while freeing first output buffer

Streaoff is being skipped if client sends commands loaded ->
idle -> allocate output buffers -> loaded -> free output buffers ->
get buffer requirements and results in failure. Do streamoff
while client frees the first output buffer to resolve the issue.
Do not streamoff when dynamic buffer mode is enabled.

Change-Id: I45edd58d827b5706990d8bdf359661bd8eb691de
1 file changed