dt-bindings: arm: mediatek: Add MT8186 Voltorb Chromebooks

Add an entry for the MT8186 based Voltorb Chromebooks, also known as the
Acer Chromebook 311 (C723/C723T). The device is a clamshell style laptop
with an optional touchscreen.
Signed-off-by: Chen-Yu Tsai <wenst@chromium.org>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20240620094746.2404753-3-wenst@chromium.orgSigned-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>

Documentation/devicetree/bindings/arm/mediatek.yaml

@@ -296,6 +296,13 @@ properties:
           - const: google,tentacruel-sku327683
           - const: google,tentacruel
           - const: mediatek,mt8186
+      - description: Google Voltorb (Acer Chromebook 311 C723/C732T)
+        items:
+          - enum:
+              - google,voltorb-sku589824
+              - google,voltorb-sku589825
+          - const: google,voltorb
+          - const: mediatek,mt8186
       - items:
           - enum:
               - mediatek,mt8186-evb