misc: constify of_device_id array

of_device_id is always used as const.
(See driver.of_match_table and open firmware functions)

Signed-off-by: Fabian Frederick <fabf@skynet.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/misc/sram.c b/drivers/misc/sram.c
index 21181fa..1ed37ce 100644
--- a/drivers/misc/sram.c
+++ b/drivers/misc/sram.c
@@ -205,7 +205,7 @@
 }
 
 #ifdef CONFIG_OF
-static struct of_device_id sram_dt_ids[] = {
+static const struct of_device_id sram_dt_ids[] = {
 	{ .compatible = "mmio-sram" },
 	{}
 };