ARM: dts: sun9i: Add i2c3 pinmux setting for A80 SoC

i2c3 has only one possible pinmux setting on the A80 SoC.
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

arch/arm/boot/dts/sun9i-a80.dtsi

@@ -352,6 +352,13 @@ pio: pinctrl@06000800 {
 			#size-cells = <0>;
 			#gpio-cells = <3>;
 
+			i2c3_pins_a: i2c3@0 {
+				allwinner,pins = "PG10", "PG11";
+				allwinner,function = "i2c3";
+				allwinner,drive = <0>;
+				allwinner,pull = <0>;
+			};
+
 			uart0_pins_a: uart0@0 {
 				allwinner,pins = "PH12", "PH13";
 				allwinner,function = "uart0";