omapfb: constify omap_video_timings structures

These omap_video_timings structures are only copied into other
structures, so they can be const.

Done with the help of Coccinelle.
Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
Cc: Bhumika Goyal <bhumirks@gmail.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>

drivers/video/fbdev/omap2/omapfb/displays/panel-lgphilips-lb035q02.c

@@ -18,7 +18,7 @@
 
 #include <video/omapfb_dss.h>
 
-static struct omap_video_timings lb035q02_timings = {
+static const struct omap_video_timings lb035q02_timings = {
 	.x_res = 320,
 	.y_res = 240,
 

drivers/video/fbdev/omap2/omapfb/displays/panel-tpo-td028ttec1.c

@@ -41,7 +41,7 @@ struct panel_drv_data {
 	struct spi_device *spi_dev;
 };
 
-static struct omap_video_timings td028ttec1_panel_timings = {
+static const struct omap_video_timings td028ttec1_panel_timings = {
 	.x_res		= 480,
 	.y_res		= 640,
 	.pixelclock	= 22153000,