dt-bindings: arm: rockchip: Add Omega4 Evaluation board

Onion Omega4 board is a board based on the RV1103B SoC.

Document its compatible.

Signed-off-by: Fabio Estevam <festevam@nabladev.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://patch.msgid.link/20260313131058.708361-3-festevam@gmail.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

Author: Fabio Estevam

Documentation/devicetree/bindings/arm/rockchip.yaml

@@ -808,6 +808,12 @@ properties:
           - const: netxeon,r89
           - const: rockchip,rk3288
 
+      - description: Onion Omega4 Evaluation board
+        items:
+          - const: onion,omega4-evb
+          - const: onion,omega4
+          - const: rockchip,rv1103b
+
       - description: OPEN AI LAB EAIDK-610
         items:
           - const: openailab,eaidk-610