dt-bindings: mfd: syscon: Add rk3588 QoS register compatible

Document rk3588 compatible for QoS registers.
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Lee Jones <lee@kernel.org>
Link: https://lore.kernel.org/r/20220906143825.199089-5-sebastian.reichel@collabora.com

Documentation/devicetree/bindings/mfd/syscon.yaml

@@ -59,6 +59,7 @@ properties:
               - rockchip,rk3368-qos
               - rockchip,rk3399-qos
               - rockchip,rk3568-qos
+              - rockchip,rk3588-qos
               - rockchip,rv1126-qos
               - samsung,exynos3-sysreg
               - samsung,exynos4-sysreg