arm64: dts: allwinner: a64: Add i2c0 pins

Add the proper pin group node to reference in board files.
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Harald Geyer <harald@ccbib.org>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>

arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi

@@ -309,6 +309,11 @@ pio: pinctrl@1c20800 {
 			interrupt-controller;
 			#interrupt-cells = <3>;
 
+			i2c0_pins: i2c0_pins {
+				pins = "PH0", "PH1";
+				function = "i2c0";
+			};
+
 			i2c1_pins: i2c1_pins {
 				pins = "PH2", "PH3";
 				function = "i2c1";