soc: arm: atmel: same5x: add support for MDIO driver

Update to dts file to add MDIO driver.

Signed-off-by: Arvin Farahmand <[email protected]>

Author: arvinf

dts/arm/atmel/same5x.dtsi

@@ -17,6 +17,12 @@
 			local-mac-address = [00 00 00 00 00 00];
 			label = "GMAC";
 			status = "disabled";
+
+			mdio: mdio {
+				compatible = "atmel,sam-mdio";
+				label = "MDIO";
+				status = "disabled";
+			};
 		};
 	};
 };