ARM: dts: rockchip: add HDMI audio to rk3288-miqi

Add the sound and i2s nodes to enable HDMI audio output on
the MiQi board.

Signed-off-by: Alex Bee <knaerzche@gmail.com>
Signed-off-by: Christian Hewitt <christianshewitt@gmail.com>
Link: https://lore.kernel.org/r/20250828163501.3829226-1-christianshewitt@gmail.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm/boot/dts/rockchip/rk3288-miqi.dts

@@ -78,6 +78,21 @@
 		regulator-always-on;
 		regulator-boot-on;
 	};
+
+	sound {
+		compatible = "simple-audio-card";
+		simple-audio-card,format = "i2s";
+		simple-audio-card,name = "HDMI";
+		simple-audio-card,mclk-fs = <512>;
+
+		simple-audio-card,codec {
+			sound-dai = <&hdmi>;
+		};
+
+		simple-audio-card,cpu {
+			sound-dai = <&i2s>;
+		};
+	};
 };
 
 &cpu0 {
@@ -285,6 +300,11 @@
 	status = "okay";
 };
 
+&i2s {
+	#sound-dai-cells = <0>;
+	status = "okay";
+};
+
 &io_domains {
 	status = "okay";