net: dsa: mt7530: fix module autoloading for OF platform drivers

It's required to create a modules.alias via MODULE_DEVICE_TABLE helper
for the OF platform driver. Otherwise, module autoloading cannot work.
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/mt7530.c

@@ -1409,6 +1409,7 @@ static const struct of_device_id mt7530_of_match[] = {
 	{ .compatible = "mediatek,mt7530" },
 	{ /* sentinel */ },
 };
+MODULE_DEVICE_TABLE(of, mt7530_of_match);
 
 static struct mdio_driver mt7530_mdio_driver = {
 	.probe  = mt7530_probe,