reset: Add of_reset_control_get to reset.h

of_reset_control_get is not declared static in drivers/reset/core.c, which
is correct as we want to use it elsewhere too. But it does not have a
protype declared anywhere under include/linux. Add a prototype / stub for it
to linux/reset.h to fix this.
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>

include/linux/reset.h

@@ -2,6 +2,7 @@
 #define _LINUX_RESET_H_
 
 struct device;
+struct device_node;
 struct reset_control;
 
 #ifdef CONFIG_RESET_CONTROLLER
@@ -33,6 +34,9 @@ static inline struct reset_control *devm_reset_control_get_optional(
 	return devm_reset_control_get(dev, id);
 }
 
+struct reset_control *of_reset_control_get(struct device_node *node,
+					   const char *id);
+
 #else
 
 static inline int reset_control_reset(struct reset_control *rstc)
@@ -75,6 +79,12 @@ static inline struct reset_control *devm_reset_control_get_optional(
 	return ERR_PTR(-ENOSYS);
 }
 
+static inline struct reset_control *of_reset_control_get(
+				struct device_node *node, const char *id)
+{
+	return ERR_PTR(-ENOSYS);
+}
+
 #endif /* CONFIG_RESET_CONTROLLER */
 
 #endif