dt-bindings: arm: mediatek: Add MT8195 Cherry Tomato Chromebooks

Document board compatibles for the MT8195 Cherry platform's
Tomato Chromebooks, at the time of writing composed of four
revisions (r1, r2, r3-r4).

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20220704101321.44835-2-angelogioacchino.delregno@collabora.com


Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>