reset: Make reset_control_ops const

The ops pointer is holding a pointer to a structure that is usually not
modified. Make it const.
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>

include/linux/reset-controller.h

@@ -38,7 +38,7 @@ struct of_phandle_args;
  * @nr_resets: number of reset controls in this reset controller device
  */
 struct reset_controller_dev {
-	struct reset_control_ops *ops;
+	const struct reset_control_ops *ops;
 	struct module *owner;
 	struct list_head list;
 	struct device_node *of_node;