mmc: mtd-sd: use devm_platform_ioremap_resource

My guess is some automated tool missed this transformation. Now looks
clearer as do what's happening. Also allows removal of struct resource.

Signed-off-by: Rosen Penev <rosenp@gmail.com>
Link: https://lore.kernel.org/r/20240930224919.355359-3-rosenp@gmail.com


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