dt-bindings: mmc: mediatek,mtk-sd: add mt8365

Add binding description for mediatek,mt8365-mmc

Signed-off-by: Alexandre Mergnat <amergnat@baylibre.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230203-evk-board-support-v2-2-6ec7cdb10ccf@baylibre.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>