dm: Use dm_scan_fdt_dev() directly where possible

Quite a few places have a bind() method which just calls dm_scan_fdt_dev().
We may as well call dm_scan_fdt_dev() directly. Update the code to do this.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/pinctrl/rockchip/pinctrl_rk3036.c b/drivers/pinctrl/rockchip/pinctrl_rk3036.c
index 3648678..6aea856 100644
--- a/drivers/pinctrl/rockchip/pinctrl_rk3036.c
+++ b/drivers/pinctrl/rockchip/pinctrl_rk3036.c
@@ -252,12 +252,6 @@
 	.get_periph_id	= rk3036_pinctrl_get_periph_id,
 };
 
-static int rk3036_pinctrl_bind(struct udevice *dev)
-{
-	/* scan child GPIO banks */
-	return dm_scan_fdt_dev(dev);
-}
-
 static int rk3036_pinctrl_probe(struct udevice *dev)
 {
 	struct rk3036_pinctrl_priv *priv = dev_get_priv(dev);
@@ -278,6 +272,6 @@
 	.of_match	= rk3036_pinctrl_ids,
 	.priv_auto_alloc_size = sizeof(struct rk3036_pinctrl_priv),
 	.ops		= &rk3036_pinctrl_ops,
-	.bind		= rk3036_pinctrl_bind,
+	.bind		= dm_scan_fdt_dev,
 	.probe		= rk3036_pinctrl_probe,
 };