ARM: dts: sun8i-h3: Add uart1 pinmux setting

Add uart1 pins for 4 pin (RX/TX/RTS/CTS) mode.
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

arch/arm/boot/dts/sun8i-h3.dtsi

@@ -540,6 +540,13 @@ uart0_pins_a: uart0@0 {
 				allwinner,drive = <SUN4I_PINCTRL_10_MA>;
 				allwinner,pull = <SUN4I_PINCTRL_NO_PULL>;
 			};
+
+			uart1_pins_a: uart1@0 {
+				allwinner,pins = "PG6", "PG7", "PG8", "PG9";
+				allwinner,function = "uart1";
+				allwinner,drive = <SUN4I_PINCTRL_10_MA>;
+				allwinner,pull = <SUN4I_PINCTRL_NO_PULL>;
+			};
 		};
 
 		ahb_rst: reset@01c202c0 {