Fix lose frame bug.

The timeout time is short for waiting unit commponent to
be drained and EOS sent to output port.

Signed-off-by: Zhong Cong <congx.zhong@intel.com>
since we download/upload video frame data in gst-omx mode. more time consumed.
it is work around to pass qa test; improve the performance in gst-omx is not our priority for now.