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/usb/emul/usb-emul-uclass.c b/drivers/usb/emul/usb-emul-uclass.c
index da91d04..6e03c1e 100644
--- a/drivers/usb/emul/usb-emul-uclass.c
+++ b/drivers/usb/emul/usb-emul-uclass.c
@@ -264,12 +264,6 @@
 	return 0;
 }
 
-int usb_emul_post_bind(struct udevice *dev)
-{
-	/* Scan the bus for devices */
-	return dm_scan_fdt_dev(dev);
-}
-
 void usb_emul_reset(struct udevice *dev)
 {
 	struct usb_dev_platdata *plat = dev_get_parent_platdata(dev);
@@ -281,7 +275,7 @@
 UCLASS_DRIVER(usb_emul) = {
 	.id		= UCLASS_USB_EMUL,
 	.name		= "usb_emul",
-	.post_bind	= usb_emul_post_bind,
+	.post_bind	= dm_scan_fdt_dev,
 	.per_child_auto_alloc_size = sizeof(struct usb_device),
 	.per_child_platdata_auto_alloc_size = sizeof(struct usb_dev_platdata),
 };