make more host drivers highmem safe v2

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In the next few merge windows I plan to gradually remove the block
layer bounce buffering, and mmc is one of the worst offenders in
terms of still using it.

This series is a blind (and untested) conversion of a few drivers to be
safe vs highmem.  There are about a few others (davinci_mmc, mvsdio,
omap, s3cmci, sh_mmcif) that don't seem quite as trivial as they have
somewhat convoluted state machines for a current pio buffers, but
any help on those would be welcome as well.

Changes since v1:
 - added a missing highmem.h include
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