dt-bindings: arm: rockchip: Add Firefly ITX-3588J board

Document board compatible bindings.

Signed-off-by: Shimrra Shai <shimrrashai@gmail.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20241216214152.58387-2-shimrrashai@gmail.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

Author: shimrrashai

Documentation/devicetree/bindings/arm/rockchip.yaml

@@ -178,6 +178,13 @@ properties:
           - const: engicam,px30-core
           - const: rockchip,px30
 
+      - description: Firefly Core-3588J-based boards
+        items:
+          - enum:
+              - firefly,itx-3588j
+          - const: firefly,core-3588j
+          - const: rockchip,rk3588
+
       - description: Firefly Core-PX30-JD4 on MB-JD4-PX30 baseboard
         items:
           - const: firefly,px30-jd4-core-mb