dt-bindings: phy: rockchip: Add rk3588 compatible

RK3568 Naneng Combo Phy driver can support RK3588 with the additional
clocks and initial configuration, so add the compatible line.
Signed-off-by: Lucas Tanure <lucas.tanure@collabora.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230314135555.44162-3-lucas.tanure@collabora.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

Documentation/devicetree/bindings/phy/phy-rockchip-naneng-combphy.yaml

@@ -13,6 +13,7 @@ properties:
   compatible:
     enum:
       - rockchip,rk3568-naneng-combphy
+      - rockchip,rk3588-naneng-combphy
 
   reg:
     maxItems: 1