ARM: dts: sun8i-h3: Add SPDIF TX pin to the H3

Add the SPDIF TX pin to the H3 dtsi.
Signed-off-by: Marcus Cooper <codekipper@gmail.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

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

@@ -375,6 +375,11 @@ mmc2_8bit_pins: mmc2_8bit {
 				bias-pull-up;
 			};
 
+			spdif_tx_pins_a: spdif@0 {
+				pins = "PA17";
+				function = "spdif";
+			};
+
 			spi0_pins: spi0 {
 				pins = "PC0", "PC1", "PC2", "PC3";
 				function = "spi0";