net: mdio-uclass: scan for dm mdio children on post-bind

If a DM_MDIO driver is used we need to scan the subnodes as well.

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Ramon Fried <rfried.dev@gmail.com>
Reviewed-by: Fabio Estevam <festevam@denx.de>
diff --git a/net/mdio-uclass.c b/net/mdio-uclass.c
index 4401492..d80037d 100644
--- a/net/mdio-uclass.c
+++ b/net/mdio-uclass.c
@@ -49,7 +49,11 @@
 		return -EINVAL;
 	}
 
+#if CONFIG_IS_ENABLED(OF_REAL)
+	return dm_scan_fdt_dev(dev);
+#else
 	return 0;
+#endif
 }
 
 int dm_mdio_read(struct udevice *mdio_dev, int addr, int devad, int reg)