dt-bindings: arm: rockchip: Add Anbernic RG-DS

Add compatible string for the Anbernic RG-DS.

Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/20260113195721.151205-5-macroalpha82@gmail.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

Author: macromorgan

Documentation/devicetree/bindings/arm/rockchip.yaml

@@ -60,6 +60,12 @@ properties:
               - anbernic,rg-arc-s
           - const: rockchip,rk3566
 
+      - description: Anbernic RK3568 Handheld Gaming Console
+        items:
+          - enum:
+              - anbernic,rg-ds
+          - const: rockchip,rk3568
+
       - description: Ariaboard Photonicat
         items:
           - const: ariaboard,photonicat