MLK-20889: mxc-jpeg: Jpeg decoder gets stuck with gplay & short yuv422 mjpeg video

Unlock hw_lock before calling v4l2_m2m_job_finish to avoid deadlock:
v4l2_m2m_job_finish -> v4l2_m2m_try_schedule -> job_ready locks hw_lock
v4l2_m2m_job_finish -> v4l2_m2m_try_run -> device_run locks hw_lock

Signed-off-by: Mirela Rabulea <mirela.rabulea@nxp.com>
Reviewed-by: Laurentiu Palcu <laurentiu.palcu@nxp.com>