mmc: mtk-sd: Add support for MT6795 Helio X10

Add support for MT6795 with a new compatible string and platform data.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20220915120923.86038-3-angelogioacchino.delregno@collabora.com


Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>