ARM: mach-imx/mach-mx25_3ds: Fix section type

Signed-off-by: NFabio Estevam <fabio.estevam@freescale.com>
Acked-by: NUwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: NSascha Hauer <s.hauer@pengutronix.de>

arch/arm/mach-imx/mach-mx25_3ds.c

@@ -180,7 +180,7 @@ static const uint32_t mx25pdk_keymap[] = {
 	KEY(3, 3, KEY_POWER),
 };
 
-static const struct matrix_keymap_data mx25pdk_keymap_data __initdata = {
+static const struct matrix_keymap_data mx25pdk_keymap_data __initconst = {
 	.keymap		= mx25pdk_keymap,
 	.keymap_size	= ARRAY_SIZE(mx25pdk_keymap),
 };