ARM: dts: sun8i: h3: orangepi-plus: Fix ethernet phy-mode

Commit bbc4d71d6354 ("net: phy: realtek: fix rtl8211e rx/tx delay
config") sets the RX/TX delay according to the phy-mode property in the
device tree. For the Orange Pi Plus board this is "rgmii", which is the
wrong setting.

Following the example of a900cac3750b ("ARM: dts: sun7i: a20: bananapro:
Fix ethernet phy-mode") the phy-mode is changed to "rgmii-id" which gets
the Ethernet working again on this board.

Fixes: bbc4d71d6354 ("net: phy: realtek: fix rtl8211e rx/tx delay config")
Reported-by: "B.R. Oake" <[e-mail]>
Reported-by: Vagrant Cascadian <[e-mail]>
Link: https://bugs.debian.org/988574
Signed-off-by: Salvatore Bonaccorso <[e-mail]>
Signed-off-by: Maxime Ripard <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

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

···
 	pinctrl-0 = <&emac_rgmii_pins>;
 	phy-supply = <&reg_gmac_3v3>;
 	phy-handle = <&ext_rgmii_phy>;
-	phy-mode = "rgmii";
+	phy-mode = "rgmii-id";
 
 	status = "okay";
 };