arm: sun8i: orangepi-zero: use internal phy-mode

Since the PHY used is internal, simply set phy-mode as internal.
Signed-off-by: Corentin Labbe <clabbe.montjoie@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

arch/arm/boot/dts/sun8i-h2-plus-orangepi-zero.dts

@@ -106,7 +106,7 @@ &ehci1 {
 
 &emac {
 	phy-handle = <&int_mii_phy>;
-	phy-mode = "mii";
+	phy-mode = "internal";
 	allwinner,leds-active-low;
 	status = "okay";
 };