lan78xx: EEE support is now a PHY property

Now that EEE support is a property of the PHY, use the PHY's DT node
when querying the EEE-related properties.

See: #2882

Signed-off-by: Phil Elwell <phil@raspberrypi.org>

drivers/net/usb/lan78xx.c

@@ -2422,7 +2422,7 @@ static int lan78xx_phy_init(struct lan78xx_net *dev)
 	mii_adv_to_linkmode_adv_t(fc, mii_adv);
 	linkmode_or(phydev->advertising, fc, phydev->advertising);
 
-	if (of_property_read_bool(dev->udev->dev.of_node,
+	if (of_property_read_bool(phydev->mdio.dev.of_node,
 				  "microchip,eee-enabled")) {
 		struct ethtool_keee edata;
 		memset(&edata, 0, sizeof(edata));