arm: sun8i: orangepi-pc: Enable dwmac-sun8i

The dwmac-sun8i hardware is present on the Orange PI PC.
It uses the internal PHY.

This patch create the needed emac node.
Signed-off-by: Corentin Labbe <clabbe.montjoie@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

arch/arm/boot/dts/sun8i-h3-orangepi-pc.dts

@@ -52,6 +52,7 @@ / {
 	compatible = "xunlong,orangepi-pc", "allwinner,sun8i-h3";
 
 	aliases {
+		ethernet0 = &emac;
 		serial0 = &uart0;
 	};
 
@@ -109,6 +110,13 @@ &ehci3 {
 	status = "okay";
 };
 
+&emac {
+	phy-handle = <&int_mii_phy>;
+	phy-mode = "mii";
+	allwinner,leds-active-low;
+	status = "okay";
+};
+
 &ir {
 	pinctrl-names = "default";
 	pinctrl-0 = <&ir_pins_a>;