arm64: dts: allwinner: h6: Add pin configs for uart1

Orange Pi 3 uses UART1 for bluetooth. Add pinconfigs so that we can use
them.
Signed-off-by: Ondrej Jirman <megous@megous.com>
Signed-off-by: Maxime Ripard <mripard@kernel.org>

arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi

@@ -299,6 +299,16 @@ uart0_ph_pins: uart0-ph-pins {
 				pins = "PH0", "PH1";
 				function = "uart0";
 			};
+
+			uart1_pins: uart1-pins {
+				pins = "PG6", "PG7";
+				function = "uart1";
+			};
+
+			uart1_rts_cts_pins: uart1-rts-cts-pins {
+				pins = "PG8", "PG9";
+				function = "uart1";
+			};
 		};
 
 		gic: interrupt-controller@3021000 {