net: mdio: aspeed: Add missing MODULE_DEVICE_TABLE

Fix loading of the driver when built as a module.

Fixes: f160e994 ("net: phy: Add mdio-aspeed")
Signed-off-by: Joel Stanley <joel@jms.id.au>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Acked-by: Andrew Jeffery <andrew@aj.id.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/mdio/mdio-aspeed.c

@@ -148,6 +148,7 @@ static const struct of_device_id aspeed_mdio_of_match[] = {
 	{ .compatible = "aspeed,ast2600-mdio", },
 	{ },
 };
+MODULE_DEVICE_TABLE(of, aspeed_mdio_of_match);
 
 static struct platform_driver aspeed_mdio_driver = {
 	.driver = {