dt-bindings: mfd: syscon: Add rk3368 QoS register compatible

Document rk3368 compatible for QoS registers.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20210925090405.2601792-2-heiko@sntech.de

Documentation/devicetree/bindings/mfd/syscon.yaml

@@ -50,6 +50,7 @@ properties:
               - rockchip,rk3066-qos
               - rockchip,rk3228-qos
               - rockchip,rk3288-qos
+              - rockchip,rk3368-qos
               - rockchip,rk3399-qos
               - rockchip,rk3568-qos
               - samsung,exynos3-sysreg