msm: vidc: do not set video state to DEINIT very early

If video state set to DEINIT before processing all frame done
packets in the list may create video failures as explained below,
the client communication to video hardware will fail because of
DEINIT state and client will close the session upon failure which
will happen in parallel to response thread processing the response
packets in the list. It may happen that client already free'd the
buffer references and response thread might access the same buffer
reference and results in use-after-free memory fault. So In case
of sys error from video hardware, set video state to DEINIT after
processing all packets in the list to avoid use-after-free failure.

Change-Id: I720790faa21923312a65dbbfd4c458f8da0c14fd
Signed-off-by: Paras Nagda <pnagda@codeaurora.org>