Add mdio label to the mdio-bus node to easily refer to it.

Use the newly created label on the GB-PC2 devicetree.
Signed-off-by: NArınç ÜNAL <arinc.unal@arinc9.com>
Reviewed-by: NSergio Paracuellos <sergio.paracuellos@gmail.com>
Signed-off-by: NThomas Bogendoerfer <tsbogend@alpha.franken.de>