mm/hwpoison: rename hwp_walk* to hwpoison_walk*

In the discussion of "Improve hugetlbfs read on HWPOISON hugepages" [1],
Matthew Wilcox suggests hwp is a bad abbreviation of hwpoison, as hwp is
already used as "an acronym by acpi, intel_pstate, some clock drivers, an
ethernet driver, and a scsi driver"[1].

So rename hwp_walk and hwp_walk_ops to hwpoison_walk and
hwpoison_walk_ops respectively.

raw_hwp_(page|list), *_raw_hwp, and raw_hwp_unreliable flag are other
major appearances of "hwp".  However, given the "raw" hint in the name, it
is easy to differentiate them from other "hwp" acronyms.  Since renaming
them is not as straightforward as renaming hwp_walk*, they are not covered
by this commit.

[1] https://lore.kernel.org/lkml/[email protected]/T/#me6fecb8ce1ad4d5769199c9e162a44bc88f7bdec

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Jiaqi Yan <[email protected]>
Reviewed-by: Anshuman Khandual <[email protected]>
Acked-by: Naoya Horiguchi <[email protected]>
Cc: Matthew Wilcox (Oracle) <[email protected]>
Cc: Miaohe Lin <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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