spi: spi-rockchip: Add rk3588-spi compatible

This adds a compatible string for the SPI controller found in
the RK3588 and RK3588s SoCs.
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Link: https://lore.kernel.org/r/20220830124452.33561-1-sebastian.reichel@collabora.comSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/spi/spi-rockchip.yaml

@@ -34,6 +34,7 @@ properties:
               - rockchip,rk3368-spi
               - rockchip,rk3399-spi
               - rockchip,rk3568-spi
+              - rockchip,rk3588-spi
               - rockchip,rv1126-spi
           - const: rockchip,rk3066-spi