xilinx_phy: Pass correct pointer to fdtdec_get_int()

This patch fixes incorrect pointer on offset device in device tree blob.
When using with the component "Ethernet 1G/2.5G BASE-X PCS/PMA or SGMII"
it does not understand what type is XAE_PHY_TYPE_1000BASE_X and trying
to change frequency.

Signed-off-by: Kamensky Ivan <kamensky.ivan@mail.ru>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>

drivers/net/phy/xilinx_phy.c

@@ -101,11 +101,11 @@ static int xilinxphy_startup(struct phy_device *phydev)
 
 static int xilinxphy_of_init(struct phy_device *phydev)
 {
-	struct udevice *dev = (struct udevice *)&phydev->dev;
 	u32 phytype;
 
 	debug("%s\n", __func__);
-	phytype = fdtdec_get_int(gd->fdt_blob, dev->of_offset, "phy-type", -1);
+	phytype = fdtdec_get_int(gd->fdt_blob, phydev->dev->of_offset,
+				 "phy-type", -1);
 	if (phytype == XAE_PHY_TYPE_1000BASE_X)
 		phydev->flags |= XAE_PHY_TYPE_1000BASE_X;