ARM: dts: sun8i: ippo-q8h: Add pinctrl properties for R_UART

Now that we have R_PIO controller support and the pinmux for R_UART,
add the correct pinctrl properties to the R_UART node.

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-ippo-q8h-v5.dts

@@ -24,6 +24,8 @@ chosen {
 
 	soc@01c00000 {
 		r_uart: serial@01f02800 {
+			pinctrl-names = "default";
+			pinctrl-0 = <&r_uart_pins_a>;
 			status = "okay";
 		};
 	};