ARM: dts: sun6i: Add pinmux settings for mmc1 to dtsi

mmc1 is used to connect to the WiFi chip on the Hummingbird A31.
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
[maxime: Changed the drive and pull values for their defines]
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

arch/arm/boot/dts/sun6i-a31.dtsi

@@ -589,6 +589,14 @@ mmc0_pins_a: mmc0@0 {
 				allwinner,pull = <SUN4I_PINCTRL_NO_PULL>;
 			};
 
+			mmc1_pins_a: mmc1@0 {
+				allwinner,pins = "PG0", "PG1", "PG2", "PG3",
+						 "PG4", "PG5";
+				allwinner,function = "mmc1";
+				allwinner,drive = <SUN4I_PINCTRL_30_MA>;
+				allwinner,pull = <SUN4I_PINCTRL_NO_PULL>;
+			};
+
 			gmac_pins_mii_a: gmac_mii@0 {
 				allwinner,pins = "PA0", "PA1", "PA2", "PA3",
 						"PA8", "PA9", "PA11",