dt-bindings: timer: rockchip: Add rk3576 compatible

Add compatible string for Rockchip RK3576 timer.
Signed-off-by: Detlev Casanova <detlev.casanova@collabora.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Heiko Stuebner <heiko@sntech.de>
Link: https://lore.kernel.org/r/20240802214612.434179-9-detlev.casanova@collabora.comSigned-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>

Documentation/devicetree/bindings/timer/rockchip,rk-timer.yaml

@@ -24,6 +24,7 @@ properties:
               - rockchip,rk3228-timer
               - rockchip,rk3229-timer
               - rockchip,rk3368-timer
+              - rockchip,rk3576-timer
               - rockchip,rk3588-timer
               - rockchip,px30-timer
           - const: rockchip,rk3288-timer