ARM: mxs: constify platform_suspend_ops

platform_suspend_ops are not supposed to change at runtime.
Functions suspend_set_ops working with const platform_suspend_ops.
So mark the non-const structs as const.
Signed-off-by: NArvind Yadav <arvind.yadav.cs@gmail.com>
Signed-off-by: NShawn Guo <shawnguo@kernel.org>

arch/arm/mach-mxs/pm.c

@@ -30,7 +30,7 @@ static int mxs_suspend_enter(suspend_state_t state)
 	return 0;
 }
 
-static struct platform_suspend_ops mxs_suspend_ops = {
+static const struct platform_suspend_ops mxs_suspend_ops = {
 	.enter = mxs_suspend_enter,
 	.valid = suspend_valid_only_mem,
 };