[media] v4l2-ctrls.c: set V4L2_CTRL_FLAG_MODIFY_LAYOUT for ROTATE

The rotate control will modify the layout by definition. Always
set this flag.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>