arm64: dts: rockchip: Enable HDMI sound on Luckfox Core3576

All RK3576 boards get their HDMI sound from SAI6, which is internally
connected to the HDMI codec. Enable this for Luckfox Core3576

Signed-off-by: Alexey Charkov <alchark@gmail.com>
Link: https://patch.msgid.link/20251229-rk3576-sound-v1-5-2f59ef0d19b1@gmail.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

Author: alchark

arch/arm64/boot/dts/rockchip/rk3576-luckfox-core3576.dtsi

@@ -246,6 +246,10 @@
 	};
 };
 
+&hdmi_sound {
+	status = "okay";
+};
+
 &hdptxphy {
 	status = "okay";
 };
@@ -691,6 +695,10 @@
 	status = "okay";
 };
 
+&sai6 {
+	status = "okay";
+};
+
 &saradc {
 	vref-supply = <&vcca_1v8_s0>;
 	status = "okay";