v4l2_subdev_{core/video}_ops structures are stored in the
fields of the v4l2_subdev_ops structure which are of type const.
Also, v4l2_subdev_ops structure is passed to a function
having its argument of type const. As these structures are never
modified, so declare them as const.
Done using Coccinelle: (One of the scripts used)

@r1 disable optional_qualifier @
identifier i;
position p;
@@
static struct v4l2_subdev_video_ops i@p = {...};

@ok1@
identifier r1.i;
position p;
struct v4l2_subdev_ops obj;
@@
obj.video=&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 v4l2_subdev_video_ops i;

File sizes before and after the changes:
   text	   data	    bss	    dec	    hex	filename

   3459	    696	      0	   4155	   103b	/media/i2c/soc_camera/imx074.o
   3835	    320	      0	   4155	   103b	/media/i2c/soc_camera/imx074.o

   4749	   1048	      8	   5805	   16ad	/media/i2c/soc_camera/mt9m001.o
   5133	    672	      8	   5813	   16b5	/media/i2c/soc_camera/mt9m001.o

   5658	   1112	      8	   6778	   1a7a	/media/i2c/soc_camera/mt9t031.o
   6042	    728	      8	   6778	   1a7a	/media/i2c/soc_camera/mt9t031.o

   6726	    784	      0	   7510	   1d56	/media/i2c/soc_camera/mt9t112.o
   7110	    408	      0	   7518	   1d5e	/media/i2c/soc_camera/mt9t112.o

   6700	    960	     16	   7676	   1dfc	/media/i2c/soc_camera/mt9v022.o
   7084	    584	     16	   7684	   1e04	/media/i2c/soc_camera/mt9v022.o

   5569	   1576	      8	   7153	   1bf1	/media/i2c/soc_camera/ov2640.o
   5953	   1200	      8	   7161	   1bf9	/media/i2c/soc_camera/ov2640.o

   3018	   2736	      0	   5754	   167a	/media/i2c/soc_camera/ov5642.o
   3394	   2352	      0	   5746	   1672	/media/i2c/soc_camera/ov5642.o

   8348	   2104	      8	  10460	   28dc	/media/i2c/soc_camera/ov6650.o
   8716	   1728	      8	  10452	   28d4	/media/i2c/soc_camera/ov6650.o

   4165	    696	      8	   4869	   1305	/media/i2c/soc_camera/ov772x.o
   4549	    320	      8	   4877	   130d	/media/i2c/soc_camera/ov772x.o

   4033	    608	      8	   4649	   1229	/media/i2c/soc_camera/ov9640.o
   4417	    232	      8	   4657	   1231	/media/i2c/soc_camera/ov9640.o

   4983	    784	      8	   5775	   168f	/media/i2c/soc_camera/ov9740.o
   5367	    408	      8	   5783	   1697	/media/i2c/soc_camera/ov9740.o

   8578	   1312	      8	   9898	   26aa i2c/soc_camera/rj54n1cb0c.o
   8962	    936	      8	   9906	   26b2 i2c/soc_camera/rj54n1cb0c.o

   3886	    696	      0	   4582	   11e6	/media/i2c/soc_camera/tw9910.o
   4270	    320	      0	   4590	   11ee	/media/i2c/soc_camera/tw9910.o
Signed-off-by: Bhumika Goyal <bhumirks@gmail.com>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>