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>

arch/arm/mach-shmobile/board-ap4evb.c

@@ -579,7 +579,8 @@ static const struct fb_videomode ap4evb_lcdc_modes[] = {
 #endif
 	},
 };
-static struct sh_mobile_meram_cfg lcd_meram_cfg = {
+
+static const struct sh_mobile_meram_cfg lcd_meram_cfg = {
 	.icb[0] = {
 		.meram_size     = 0x40,
 	},
@@ -856,7 +857,7 @@ static long ap4evb_clk_optimize(unsigned long target, unsigned long *best_freq,
 	return error;
 }
 
-static struct sh_mobile_meram_cfg hdmi_meram_cfg = {
+static const struct sh_mobile_meram_cfg hdmi_meram_cfg = {
 	.icb[0] = {
 		.meram_size     = 0x100,
 	},

arch/arm/mach-shmobile/board-mackerel.c

@@ -369,7 +369,7 @@ static int mackerel_get_brightness(void)
 	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 platform_device hdmi_device = {
 	},
 };
 
-static struct sh_mobile_meram_cfg hdmi_meram_cfg = {
+static const struct sh_mobile_meram_cfg hdmi_meram_cfg = {
 	.icb[0] = {
 		.meram_size     = 0x100,
 	},