ASoC: dt-bindings: rockchip: i2s-tdm: Add RK3588 compatible

This adds the compatible string for the RK3588 SoC.
Signed-off-by: Nicolas Frattaroli <frattaroli.nicolas@gmail.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20221025124132.399729-4-frattaroli.nicolas@gmail.comSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/rockchip,i2s-tdm.yaml

@@ -21,6 +21,7 @@ properties:
       - rockchip,rk1808-i2s-tdm
       - rockchip,rk3308-i2s-tdm
       - rockchip,rk3568-i2s-tdm
+      - rockchip,rk3588-i2s-tdm
       - rockchip,rv1126-i2s-tdm
 
   reg: