net: phy: dp83867: switch to use phy_get_ofnode()

Use PHY API phy_get_ofnode() helper to get PHY DT node.

Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
Tested-by: Siva Durga Prasad Paladugu <siva.durga.paladugu@xilinx.com>

drivers/net/phy/ti.c

@@ -172,8 +172,11 @@ void phy_write_mmd_indirect(struct phy_device *phydev, int prtad,
 static int dp83867_of_init(struct phy_device *phydev)
 {
 	struct dp83867_private *dp83867 = phydev->priv;
-	struct udevice *dev = phydev->dev;
-	ofnode node = dev_ofnode(dev);
+	ofnode node;
+
+	node = phy_get_ofnode(phydev);
+	if (!ofnode_valid(node))
+		return -EINVAL;
 
 	if (ofnode_read_bool(node, "ti,max-output-impedance"))
 		dp83867->io_impedance = DP83867_IO_MUX_CFG_IO_IMPEDANCE_MAX;