mmc: mtk-sd: Aggregate writes for MSDC_PATCH_BIT1/2 setup

mmc: mtk-sd: Aggregate writes for MSDC_PATCH_BIT1/2 setup

Instead of continuously reading and writing to the patch bit 1/2
registers, prepare the final values to write to those and write
just once per register during the setup phase.

This makes the driver slightly smaller and also slightly improves
the execution time of the msdc_init_hw function, called not only
at probe time, but also when resuming from system suspend.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20250325110701.52623-3-angelogioacchino.delregno@collabora.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>