ARM: imx27/dt: make dt_compat entry const

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
diff --git a/arch/arm/mach-imx/imx27-dt.c b/arch/arm/mach-imx/imx27-dt.c
index eee0cc8..52efe4d 100644
--- a/arch/arm/mach-imx/imx27-dt.c
+++ b/arch/arm/mach-imx/imx27-dt.c
@@ -75,7 +75,7 @@
 	.init = imx27_timer_init,
 };
 
-static const char *imx27_dt_board_compat[] __initdata = {
+static const char * const imx27_dt_board_compat[] __initconst = {
 	"fsl,imx27",
 	NULL
 };