ARM: dts: sun8i: Add pinmux setting for 8bit mmc2

mmc2 is mostly used with eMMC flash chips, as an alternative to
raw NAND flash chips. 8 bit mmc is commonly used.
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

arch/arm/boot/dts/sun8i-a23-a33.dtsi

@@ -366,6 +366,16 @@ mmc1_pins_a: mmc1@0 {
 				allwinner,pull = <SUN4I_PINCTRL_NO_PULL>;
 			};
 
+			mmc2_8bit_pins: mmc2_8bit {
+				allwinner,pins = "PC5", "PC6", "PC8",
+						 "PC9", "PC10", "PC11",
+						 "PC12", "PC13", "PC14",
+						 "PC15";
+				allwinner,function = "mmc2";
+				allwinner,drive = <SUN4I_PINCTRL_30_MA>;
+				allwinner,pull = <SUN4I_PINCTRL_NO_PULL>;
+			};
+
 			i2c0_pins_a: i2c0@0 {
 				allwinner,pins = "PH2", "PH3";
 				allwinner,function = "i2c0";