sunxi: DT: A64: update board .dts files from Linux

Update the .dts files for the various boards with an Allwinner A64 SoC.
This is as of v4.18-rc3, exactly Linux commit:
commit 818668055c9d588c9a9d151e3b258ed1adacba0b
Author: Jagan Teki <jagan@amarulasolutions.com>
Date:   Mon Apr 23 12:02:39 2018 +0530

    arm64: dts: allwinner: a64: bananapi-m64: add usb otg

It updates the existing DT files, adds the newly added axp803.dtsi and
removes our temporary kludge file to get Ethernet support in U-Boot.
I left the amarula-relic alone, as this DT has not reached mainline yet.
The changes are not critical anyway, and the next sync will fix this.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Acked-by: Maxime Ripard <maxime.ripard@bootlin.com>
Acked-by: Jagan Teki <jagan@amarulasolutions.com>
Tested-by: Jagan Teki <jagan@amarulasolutions.com>
diff --git a/arch/arm/dts/sun50i-a64-pine64-plus.dts b/arch/arm/dts/sun50i-a64-pine64-plus.dts
index 790d14d..24f1aac 100644
--- a/arch/arm/dts/sun50i-a64-pine64-plus.dts
+++ b/arch/arm/dts/sun50i-a64-pine64-plus.dts
@@ -46,5 +46,20 @@
 	model = "Pine64+";
 	compatible = "pine64,pine64-plus", "allwinner,sun50i-a64";
 
-	/* TODO: Camera, Ethernet PHY, touchscreen, etc. */
+	/* TODO: Camera, touchscreen, etc. */
+};
+
+&emac {
+	pinctrl-names = "default";
+	pinctrl-0 = <&rgmii_pins>;
+	phy-mode = "rgmii";
+	phy-handle = <&ext_rgmii_phy>;
+	status = "okay";
+};
+
+&mdio {
+	ext_rgmii_phy: ethernet-phy@1 {
+		compatible = "ethernet-phy-ieee802.3-c22";
+		reg = <1>;
+	};
 };