led: introduce led_bind_generic()

All existing drivers in drivers/led/ contain a .bind method that does
exactly the same thing, with just the actual driver name
differing. Create a helper so all those individual methods can be
changed to one-liners.

Reviewed-by: Marek Vasut <marex@denx.de>
Signed-off-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk>

drivers/led/led-uclass.c

@@ -11,9 +11,27 @@
 #include <errno.h>
 #include <led.h>
 #include <dm/device-internal.h>
+#include <dm/lists.h>
 #include <dm/root.h>
 #include <dm/uclass-internal.h>
 
+int led_bind_generic(struct udevice *parent, const char *driver_name)
+{
+	struct udevice *dev;
+	ofnode node;
+	int ret;
+
+	dev_for_each_subnode(node, parent) {
+		ret = device_bind_driver_to_node(parent, driver_name,
+						 ofnode_get_name(node),
+						 node, &dev);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
 int led_get_by_label(const char *label, struct udevice **devp)
 {
 	struct udevice *dev;