omapfb: panel-sony-acx565akm: constify attribute_group structures.

attribute_group are not supposed to change at runtime. All functions
working with attribute_group provided by <linux/sysfs.h> work
with const attribute_group. So mark the non-const structs as const.

File size before:
   text	   data	    bss	    dec	    hex	filename
   5227	    560	      0	   5787	   169b	panel-sony-acx565akm

File size after adding 'const':
   text	   data	    bss	    dec	    hex	filename
   5291	    496	      0	   5787	   169b	panel-sony-acx565akm.o

Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>

drivers/video/fbdev/omap2/omapfb/displays/panel-sony-acx565akm.c

@@ -509,7 +509,7 @@ static struct attribute *bldev_attrs[] = {
 	NULL,
 };
 
-static struct attribute_group bldev_attr_group = {
+static const struct attribute_group bldev_attr_group = {
 	.attrs = bldev_attrs,
 };