V4L/DVB (9898): v4l2: Add privacy control

The privacy control prevents video from being acquired by the camera. A true
value indicates that no image can be captured. Devices that implement the
privacy control must support read access and may support write access.

Signed-off-by: Laurent Pinchart <laurent.pinchart@skynet.be>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

include/linux/videodev2.h

@@ -1122,6 +1122,8 @@ enum  v4l2_exposure_auto_type {
 #define V4L2_CID_ZOOM_RELATIVE			(V4L2_CID_CAMERA_CLASS_BASE+14)
 #define V4L2_CID_ZOOM_CONTINUOUS		(V4L2_CID_CAMERA_CLASS_BASE+15)
 
+#define V4L2_CID_PRIVACY			(V4L2_CID_CAMERA_CLASS_BASE+16)
+
 /*
  *	T U N I N G
  */