arm64: dts: allwinner: a64: OrangePi Win: Fix ethernet node

RX/TX delay on OrangePi Win board is set on PHY. Reflect that in
ethernet node.

Fixes: 93d6a27cfc ("arm64: dts: allwinner: a64: Orange Pi Win: Add Ethernet node")
Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20201022185839.2779245-1-jernej.skrabec@siol.net

arch/arm64/boot/dts/allwinner/sun50i-a64-orangepi-win.dts

@@ -120,7 +120,7 @@
 &emac {
 	pinctrl-names = "default";
 	pinctrl-0 = <&rgmii_pins>;
-	phy-mode = "rgmii";
+	phy-mode = "rgmii-id";
 	phy-handle = <&ext_rgmii_phy>;
 	phy-supply = <&reg_gmac_3v3>;
 	status = "okay";