Revert "mmc: moxart-mmc: Use sg_miter for PIO"

This reverts commit 3ee0e7c3.

The patch is not working for unknown reasons and I would
need access to the hardware to fix the bug.

This shouldn't matter anyway: the Moxa Art is not expected
to use highmem, and sg_miter() is only necessary to have
to properly deal with highmem.

Reported-by: Sergei Antonov <saproj@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Fixes: 3ee0e7c3 ("mmc: moxart-mmc: Use sg_miter for PIO")
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20240606-mmc-moxart-revert-v1-1-a01c2f40de9c@linaro.org


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