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

Document board compatible bindings.

Signed-off-by: Shimrra Shai <[email protected]>
Acked-by: Krzysztof Kozlowski <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Heiko Stuebner <[email protected]>

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