[media] media: pci: constify vb2_ops structure

Declare vb2_ops structure as const as it is only stored in
the ops field of a vb2_queue structure. This field is of type
const, so vb2_ops structures having same properties can be made
const too.
Done using Coccinelle:

@r1 disable optional_qualifier@
identifier i;
position p;
@@
static struct vb2_ops i@p={...};

@ok1@
identifier r1.i;
position p;
struct sta2x11_vip vip;
struct vb2_queue q;
@@
(
vip.vb_vidq.ops=&i@p
|
q.ops=&i@p
)

@bad@
position p!={r1.p,ok1.p};
identifier r1.i;
@@
i@p

@depends on !bad disable optional_qualifier@
identifier r1.i;
@@
+const
struct vb2_ops i;

File size before:
   text	   data	    bss	    dec	    hex	filename
   8448	    440	      0	   8888	   22b8	media/pci/sta2x11/sta2x11_vip.o

File size after:
   text	   data	    bss	    dec	    hex	filename
   8552	    352	      0	   8904	   22c8	media/pci/sta2x11/sta2x11_vip.o
Signed-off-by: Bhumika Goyal <bhumirks@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/pci/sta2x11/sta2x11_vip.c

@@ -377,7 +377,7 @@ static void stop_streaming(struct vb2_queue *vq)
 	spin_unlock(&vip->lock);
 }
 
-static struct vb2_ops vip_video_qops = {
+static const struct vb2_ops vip_video_qops = {
 	.queue_setup		= queue_setup,
 	.buf_init		= buffer_init,
 	.buf_prepare		= buffer_prepare,