ARM: dts: sun8i: h3: Adding UART3 RTS and CTS Pins

This node adds the definition for the UART3 RTS and CTS Pins

That makes it able to use UART3 with RTS and CTS.
Signed-off-by: Philipp Rossak <embed3d@gmail.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

arch/arm/boot/dts/sunxi-h3-h5.dtsi

@@ -381,6 +381,11 @@ uart3_pins: uart3 {
 				pins = "PA13", "PA14";
 				function = "uart3";
 			};
+
+			uart3_rts_cts_pins: uart3_rts_cts {
+				pins = "PA15", "PA16";
+				function = "uart3";
+			};
 		};
 
 		timer@01c20c00 {