dt-bindings: arm64: dts: mediatek: Add mt8183-kukui-krane-sku176

The krane-sku176 is the Lenovo IdeaPad Duet Chromebook. A 2-in-1
detachable device using the MediaTek MT8183 SoC.
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Link: https://lore.kernel.org/r/20200625101757.101775-2-enric.balletbo@collabora.comSigned-off-by: Matthias Brugger <matthias.bgg@gmail.com>

Documentation/devicetree/bindings/arm/mediatek.yaml

@@ -114,4 +114,9 @@ properties:
           - enum:
               - mediatek,mt8183-evb
           - const: mediatek,mt8183
+      - description: Google Krane (Lenovo IdeaPad Duet, 10e,...)
+        items:
+          - const: google,krane-sku176
+          - const: google,krane
+          - const: mediatek,mt8183
 ...