FROMLIST: scsi: ufs: Transform set_dirty to iterate_rgn

Given a transfer length, set_dirty meticulously runs over all the
entries, across subregions and regions if needed. Currently its only use
is to mark dirty blocks, but soon HCM may profit from it as well, when
managing its read counters.

Bug: 183467926
Bug: 170940265
Bug: 183454255

Link: https://lore.kernel.org/lkml/20210607061401.58884-4-avri.altman@wdc.com/


Signed-off-by: Avri Altman <avri.altman@wdc.com>
Reviewed-by: Daejun Park <daejun7.park@samsung.com>
Change-Id: I916f4bf80490e31e5ef797d67647a41a07cefa02