rockchip: dts: Sync up SPDIF node with Linux

This has been added and we have references to it in the rock2 board. Add
this node.

Signed-off-by: Simon Glass <sjg@chromium.org>

arch/arm/dts/rk3288.dtsi

@@ -631,6 +631,21 @@
 		status = "disabled";
 	};
 
+	spdif: sound@ff88b0000 {
+		compatible = "rockchip,rk3288-spdif", "rockchip,rk3066-spdif";
+		reg = <0xff8b0000 0x10000>;
+		#sound-dai-cells = <0>;
+		clock-names = "hclk", "mclk";
+		clocks = <&cru HCLK_SPDIF8CH>, <&cru SCLK_SPDIF8CH>;
+		dmas = <&dmac_bus_s 3>;
+		dma-names = "tx";
+		interrupts = <GIC_SPI 85 IRQ_TYPE_LEVEL_HIGH>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&spdif_tx>;
+		rockchip,grf = <&grf>;
+		status = "disabled";
+	};
+
 	i2s: i2s@ff890000 {
 		compatible = "rockchip,rk3288-i2s", "rockchip,rk3066-i2s";
 		reg = <0xff890000 0x10000>;
@@ -1417,6 +1432,12 @@
 						<4 3 3 &pcfg_pull_none>;
 			};
 		};
+
+		spdif {
+			spdif_tx: spdif-tx {
+				rockchip,pins = <RK_GPIO6 11 RK_FUNC_1 &pcfg_pull_none>;
+			};
+		};
 	};
 
 	power: power-controller {