arm64: dts: allwinner: beelink-gs1: Enable both RGMII RX/TX delay

Before the commit bbc4d71d63 ("net: phy: realtek: fix rtl8211e rx/tx
delay config"), the software overwrite for RX/TX delays of the RTL8211e
were not working properly and the Beelink GS1 had both RX/TX delay of RGMII
interface set using pull-up on the TXDLY and RXDLY pins.

Now that these delays are working properly they overwrite the HW
config and set this to 'rgmii' meaning no delay on both RX/TX.
This makes the ethernet of this board not working anymore.

Set the phy-mode to 'rgmii-id' meaning RGMII with RX/TX delays
in the device-tree to keep the correct configuration.

Fixes: 089bee8dd1 ("arm64: dts: allwinner: h6: Introduce Beelink GS1 board")
Signed-off-by: Clément Péron <peron.clem@gmail.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Acked-by: Chen-Yu Tsai <wens@csie.org>
Link: https://lore.kernel.org/r/20201018172409.1754775-1-peron.clem@gmail.com

arch/arm64/boot/dts/allwinner/sun50i-h6-beelink-gs1.dts

@@ -97,7 +97,7 @@
 &emac {
 	pinctrl-names = "default";
 	pinctrl-0 = <&ext_rgmii_pins>;
-	phy-mode = "rgmii";
+	phy-mode = "rgmii-id";
 	phy-handle = <&ext_rgmii_phy>;
 	phy-supply = <&reg_aldo2>;
 	status = "okay";