video: driver: fixes for upstream/downstream driver compilation

- do not use vidc_v4l2_extensions.h for upstream driver compilation.
- resolve compilation issues in upstream and downstream driver due
  to above change.
- add volatile flag in the database.

Signed-off-by: Darshana Patil <quic_darshana@quicinc.com>
Change-Id: I1985cae29a459af2250f7044d85c5cd22cdd68f7

driver/vidc/inc/msm_vidc_driver.h

@@ -8,7 +8,6 @@
 
 #include <linux/workqueue.h>
 #include <linux/iommu.h>
-#include <media/v4l2_vidc_extensions.h>
 #include "msm_vidc_internal.h"
 #include "msm_vidc_core.h"
 #include "msm_vidc_inst.h"