const: constify remaining dev_pm_ops

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/serial/pxa.c b/drivers/serial/pxa.c
index 4a82104..56ee082 100644
--- a/drivers/serial/pxa.c
+++ b/drivers/serial/pxa.c
@@ -756,7 +756,7 @@
         return 0;
 }
 
-static struct dev_pm_ops serial_pxa_pm_ops = {
+static const struct dev_pm_ops serial_pxa_pm_ops = {
 	.suspend	= serial_pxa_suspend,
 	.resume		= serial_pxa_resume,
 };