dt-bindings: arm: rockchip: Add Xunlong Orange Pi 3B

Add devicetree binding for the Xunlong Orange Pi 3B board.

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240626230319.1425316-2-jonas@kwiboo.se
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

Author: Kwiboo

Documentation/devicetree/bindings/arm/rockchip.yaml

@@ -993,6 +993,14 @@ properties:
           - const: wolfvision,rk3568-pf5
           - const: rockchip,rk3568
 
+      - description: Xunlong Orange Pi 3B
+        items:
+          - enum:
+              - xunlong,orangepi-3b-v1.1
+              - xunlong,orangepi-3b-v2.1
+          - const: xunlong,orangepi-3b
+          - const: rockchip,rk3566
+
       - description: Xunlong Orange Pi 5 Plus
         items:
           - const: xunlong,orangepi-5-plus