dt-bindings: arm: rockchip: Add gru-scarlet-dumo board

Dumo is another variant of Scarlet, also known as the ASUS Chromebook
Tablet CT100. This is almost the same as Scarlet-Innolux, but uses a
specific calibration variant for the WiFi module.

Add an entry for the board compatibles.
Signed-off-by: Chen-Yu Tsai <wenst@chromium.org>
Link: https://lore.kernel.org/r/20210812094753.2359087-2-wenst@chromium.orgSigned-off-by: Heiko Stuebner <heiko@sntech.de>

Documentation/devicetree/bindings/arm/rockchip.yaml

@@ -298,6 +298,34 @@ properties:
           - const: google,veyron
           - const: rockchip,rk3288
 
+      - description: Google Scarlet - Dumo (ASUS Chromebook Tablet CT100)
+        items:
+          - const: google,scarlet-rev15-sku0
+          - const: google,scarlet-rev15
+          - const: google,scarlet-rev14-sku0
+          - const: google,scarlet-rev14
+          - const: google,scarlet-rev13-sku0
+          - const: google,scarlet-rev13
+          - const: google,scarlet-rev12-sku0
+          - const: google,scarlet-rev12
+          - const: google,scarlet-rev11-sku0
+          - const: google,scarlet-rev11
+          - const: google,scarlet-rev10-sku0
+          - const: google,scarlet-rev10
+          - const: google,scarlet-rev9-sku0
+          - const: google,scarlet-rev9
+          - const: google,scarlet-rev8-sku0
+          - const: google,scarlet-rev8
+          - const: google,scarlet-rev7-sku0
+          - const: google,scarlet-rev7
+          - const: google,scarlet-rev6-sku0
+          - const: google,scarlet-rev6
+          - const: google,scarlet-rev5-sku0
+          - const: google,scarlet-rev5
+          - const: google,scarlet
+          - const: google,gru
+          - const: rockchip,rk3399
+
       - description: Google Scarlet - Kingdisplay (Acer Chromebook Tab 10)
         items:
           - const: google,scarlet-rev15-sku7