dt-bindings: arm: rockchip: Add Geniatech XPI-3128

Add Geniatech XPI-3128, a RK3128 based single board computer.
Signed-off-by: Alex Bee <knaerzche@gmail.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20231119130351.112261-4-knaerzche@gmail.comSigned-off-by: Heiko Stuebner <heiko@sntech.de>

Documentation/devicetree/bindings/arm/rockchip.yaml

@@ -237,6 +237,11 @@ properties:
           - const: geekbuying,geekbox
           - const: rockchip,rk3368
 
+      - description: Geniatech XPI-3128
+        items:
+          - const: geniatech,xpi-3128
+          - const: rockchip,rk3128
+
       - description: Google Bob (Asus Chromebook Flip C101PA)
         items:
           - const: google,bob-rev13