dt-bindings: mfd: syscon: Add rk3568 QoS register compatible

Document rk3568 compatible for QoS registers.
Signed-off-by: Liang Chen <cl@rock-chips.com>
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

Documentation/devicetree/bindings/mfd/syscon.yaml

@@ -50,6 +50,7 @@ properties:
               - rockchip,rk3228-qos
               - rockchip,rk3288-qos
               - rockchip,rk3399-qos
+              - rockchip,rk3568-qos
               - samsung,exynos3-sysreg
               - samsung,exynos4-sysreg
               - samsung,exynos5-sysreg