media: subdev: Constify v4l2_subdev_set_routing_with_fmt() param

The routing parameter of v4l2_subdev_set_routing_with_fmt() is missing
'const'. Add it.

Signed-off-by: Tomi Valkeinen <[e-mail]>
Reviewed-by: Jacopo Mondi <[e-mail]>
Signed-off-by: Sakari Ailus <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

drivers/media/v4l2-core/v4l2-subdev.c

···
 
 int v4l2_subdev_set_routing_with_fmt(struct v4l2_subdev *sd,
 				     struct v4l2_subdev_state *state,
-				     struct v4l2_subdev_krouting *routing,
+				     const struct v4l2_subdev_krouting *routing,
 				     const struct v4l2_mbus_framefmt *fmt)
 {
 	struct v4l2_subdev_stream_configs *stream_configs;

include/media/v4l2-subdev.h

···
  */
 int v4l2_subdev_set_routing_with_fmt(struct v4l2_subdev *sd,
 				     struct v4l2_subdev_state *state,
-				     struct v4l2_subdev_krouting *routing,
+				     const struct v4l2_subdev_krouting *routing,
 				     const struct v4l2_mbus_framefmt *fmt);
 
 /**