net: ethernet: lantiq_etop: Call SET_NETDEV_DEV()

The Lantiq Etop driver calls into PHYLIB which now checks for
net_device->dev.parent, so make sure we do set it before calling into
any MDIO/PHYLIB related function.

Fixes: ec988ad78ed6 ("phy: Don't increment MDIO bus refcount unless it's a different owner")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/lantiq_etop.c

@@ -704,6 +704,7 @@ ltq_etop_probe(struct platform_device *pdev)
 	priv->pldata = dev_get_platdata(&pdev->dev);
 	priv->netdev = dev;
 	spin_lock_init(&priv->lock);
+	SET_NETDEV_DEV(dev, &pdev->dev);
 
 	for (i = 0; i < MAX_DMA_CHAN; i++) {
 		if (IS_TX(i))