media: staging/intel-ipu3: Constify static struct v4l2_subdev_internal_ops

The only usage of imgu_subdev_internal_ops is to assign its address to
the internal_ops field in the v4l2_subdev struct, which is a pointer to
const v4l2_subdev_internal_ops. Make it const to allow the compiler to
put it in read-only memory.
Signed-off-by: Rikard Falkeborn <rikard.falkeborn@gmail.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/staging/media/ipu3/ipu3-v4l2.c

@@ -864,7 +864,7 @@ static int imgu_vidioc_g_meta_fmt(struct file *file, void *fh,
 
 /******************** function pointers ********************/
 
-static struct v4l2_subdev_internal_ops imgu_subdev_internal_ops = {
+static const struct v4l2_subdev_internal_ops imgu_subdev_internal_ops = {
 	.open = imgu_subdev_open,
 };