dt-bindings: arm: rockchip: Add Rockchip RK3128 Evaluation board

Add Rockchip RK3128 Evaluation board.
Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/dca18633-54d4-1264-725c-213d82fdf1c5@gmail.comSigned-off-by: Heiko Stuebner <heiko@sntech.de>

Documentation/devicetree/bindings/arm/rockchip.yaml

@@ -695,6 +695,11 @@ properties:
           - const: rockchip,rk3036-evb
           - const: rockchip,rk3036
 
+      - description: Rockchip RK3128 Evaluation board
+        items:
+          - const: rockchip,rk3128-evb
+          - const: rockchip,rk3128
+
       - description: Rockchip RK3228 Evaluation board
         items:
           - const: rockchip,rk3228-evb