net: ethernet: cpmac: Call SET_NETDEV_DEV()

The TI CPMAC 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>
diff --git a/drivers/net/ethernet/ti/cpmac.c b/drivers/net/ethernet/ti/cpmac.c
index fa0cfda..28097be 100644
--- a/drivers/net/ethernet/ti/cpmac.c
+++ b/drivers/net/ethernet/ti/cpmac.c
@@ -1113,6 +1113,7 @@
 	if (!dev)
 		return -ENOMEM;
 
+	SET_NETDEV_DEV(dev, &pdev->dev);
 	platform_set_drvdata(pdev, dev);
 	priv = netdev_priv(dev);