arm64: dts: rockchip: Enable HDMI sound on FriendlyElec NanoPi M5

All RK3576 boards get their HDMI sound from SAI6, which is internally
connected to the HDMI codec. Enable this for FriendlyElec NanoPi M5.

Signed-off-by: Alexey Charkov <alchark@gmail.com>
Link: https://patch.msgid.link/20251229-rk3576-sound-v1-4-2f59ef0d19b1@gmail.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

Author: alchark

arch/arm64/boot/dts/rockchip/rk3576-nanopi-m5.dts

@@ -340,6 +340,10 @@
 	};
 };
 
+&hdmi_sound {
+	status = "okay";
+};
+
 &hdptxphy {
 	status = "okay";
 };
@@ -864,6 +868,10 @@
 	status = "okay";
 };
 
+&sai6 {
+	status = "okay";
+};
+
 &saradc {
 	vref-supply = <&vcca_1v8_s0>;
 	status = "okay";