dt-bindings: arm64: dts: mediatek: Add more SKUs for mt8183 fennel board

Add sku2 and sku7 which uses different audio codec than other fennel boards.
Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
Link: https://lore.kernel.org/r/20211110063118.3412564-6-hsinyi@chromium.orgSigned-off-by: Matthias Brugger <matthias.bgg@gmail.com>

Documentation/devicetree/bindings/arm/mediatek.yaml

@@ -147,7 +147,9 @@ properties:
           - enum:
               - google,fennel-sku0
               - google,fennel-sku1
+              - google,fennel-sku2
               - google,fennel-sku6
+              - google,fennel-sku7
           - const: google,fennel
           - const: mediatek,mt8183
       - description: Google Juniper (Acer Chromebook Spin 311) / Kenzo (Acer Chromebook 311)