media: staging: media: davinci_vpfe: constify vb2_ops structures

These vb2_ops structures are only stored in the ops field of a
vb2_queue structure, which is declared as const.  Thus the vb2_ops
structures themselves can be const.

Done with the help of Coccinelle.

// <smpl>
@r disable optional_qualifier@
identifier i;
position p;
@@
static struct vb2_ops i@p = { ... };

@ok@
identifier r.i;
struct vb2_queue e;
position p;
@@
e.ops = &i@p;

@bad@
position p != {r.p,ok.p};
identifier r.i;
struct vb2_ops e;
@@
e@i@p

@depends on !bad disable optional_qualifier@
identifier r.i;
@@
static
+const
 struct vb2_ops i = { ... };
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/staging/media/davinci_vpfe/vpfe_video.c

@@ -1304,7 +1304,7 @@ static void vpfe_buf_cleanup(struct vb2_buffer *vb)
 		list_del_init(&buf->list);
 }
 
-static struct vb2_ops video_qops = {
+static const struct vb2_ops video_qops = {
 	.queue_setup		= vpfe_buffer_queue_setup,
 	.buf_init		= vpfe_buffer_init,
 	.buf_prepare		= vpfe_buffer_prepare,