Driver Core: Make PM operations a const pointer

They are not supposed to be modified by drivers, so make them const.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 455e559..ae5c4aa 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -889,7 +889,7 @@
 
 #endif /* !CONFIG_HIBERNATION */
 
-static struct dev_pm_ops platform_dev_pm_ops = {
+static const struct dev_pm_ops platform_dev_pm_ops = {
 	.prepare = platform_pm_prepare,
 	.complete = platform_pm_complete,
 	.suspend = platform_pm_suspend,