V4L/DVB (12625): Add new V4L2_FMT_FLAG_EMULATED flag to videodev2.h

V4L2_FMT_FLAG_EMULATED	0x0002	This format is not native to the device but
emulated through software (usually libv4l2), where possible try to use a
native format instead for better performance.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

include/linux/videodev2.h

@@ -375,6 +375,7 @@ struct v4l2_fmtdesc {
 };
 
 #define V4L2_FMT_FLAG_COMPRESSED 0x0001
+#define V4L2_FMT_FLAG_EMULATED   0x0002
 
 #if 1
 	/* Experimental Frame Size and frame rate enumeration */