suspend: constify platform_suspend_ops

While at it, fix two checkpatch errors.
Several non-const struct instances constified by this patch were added after
the introduction of platform_suspend_ops in checkpatch.pl's list of "should
be const" structs (79404849e90a41ea2109bd0e2f7c7164b0c4ce73).

Patch against mainline.
Inspired by hunks of the grsecurity patch, updated for newer kernels.

Signed-off-by: Lionel Debroux <lionel_debroux@yahoo.fr>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/arch/arm/mach-at91/pm.c b/arch/arm/mach-at91/pm.c
index dafbacc..ea53f4d 100644
--- a/arch/arm/mach-at91/pm.c
+++ b/arch/arm/mach-at91/pm.c
@@ -301,7 +301,7 @@
 }
 
 
-static struct platform_suspend_ops at91_pm_ops ={
+static const struct platform_suspend_ops at91_pm_ops = {
 	.valid	= at91_pm_valid_state,
 	.begin	= at91_pm_begin,
 	.enter	= at91_pm_enter,