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/pci/pci_sandbox.c b/drivers/pci/pci_sandbox.c
index b562813..6a84ee3 100644
--- a/drivers/pci/pci_sandbox.c
+++ b/drivers/pci/pci_sandbox.c
@@ -51,12 +51,6 @@
 	return ops->read_config(emul, offset, valuep, size);
 }
 
-static int sandbox_pci_child_post_bind(struct udevice *dev)
-{
-	/* Attach an emulator if we can */
-	return dm_scan_fdt_dev(dev);
-}
-
 static const struct dm_pci_ops sandbox_pci_ops = {
 	.read_config = sandbox_pci_read_config,
 	.write_config = sandbox_pci_write_config,
@@ -72,7 +66,9 @@
 	.id	= UCLASS_PCI,
 	.of_match = sandbox_pci_ids,
 	.ops	= &sandbox_pci_ops,
-	.child_post_bind = sandbox_pci_child_post_bind,
+
+	/* Attach an emulator if we can */
+	.child_post_bind = dm_scan_fdt_dev,
 	.per_child_platdata_auto_alloc_size =
 			sizeof(struct pci_child_platdata),
 };