arm: mach-shmobile: Constify sh_mobile_meram_cfg structures

The structures, passed to the sh_mobile_lcdcfb driver through platform
data, are read only by the driver. Make them const.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
diff --git a/arch/arm/mach-shmobile/board-mackerel.c b/arch/arm/mach-shmobile/board-mackerel.c
index a6ad4a4b..e761b28 100644
--- a/arch/arm/mach-shmobile/board-mackerel.c
+++ b/arch/arm/mach-shmobile/board-mackerel.c
@@ -369,7 +369,7 @@
 	return gpio_get_value(GPIO_PORT31);
 }
 
-static struct sh_mobile_meram_cfg lcd_meram_cfg = {
+static const struct sh_mobile_meram_cfg lcd_meram_cfg = {
 	.icb[0] = {
 		.meram_size     = 0x40,
 	},
@@ -455,7 +455,7 @@
 	},
 };
 
-static struct sh_mobile_meram_cfg hdmi_meram_cfg = {
+static const struct sh_mobile_meram_cfg hdmi_meram_cfg = {
 	.icb[0] = {
 		.meram_size     = 0x100,
 	},