arm64: dts: rockchip: disable display subsystem for Lunzn Fastrhino R6xS

The R66S and R68S boards do not have HDMI output, so disable
the display subsystem.

Fixes: c79dab407a ("arm64: dts: rockchip: Add Lunzn Fastrhino R66S")
Signed-off-by: Chukun Pan <amadeus@jmu.edu.cn>
Link: https://lore.kernel.org/r/20240701143028.1203997-3-amadeus@jmu.edu.cn
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm64/boot/dts/rockchip/rk3568-fastrhino-r66s.dtsi

@@ -115,6 +115,10 @@
 	cpu-supply = <&vdd_cpu>;
 };
 
+&display_subsystem {
+	status = "disabled";
+};
+
 &gpu {
 	mali-supply = <&vdd_gpu>;
 	status = "okay";