selftests/mm: factor out thp settings management

The khugepaged test has a useful framework for save/restore/pop/push of
all thp settings via the sysfs interface.  This will be useful to
explicitly control multi-size THP settings in other tests, so let's move
it out of khugepaged and into its own thp_settings.[c|h] utility.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Ryan Roberts <[email protected]>
Tested-by: Alistair Popple <[email protected]>
Acked-by: David Hildenbrand <[email protected]>
Tested-by: Kefeng Wang <[email protected]>
Tested-by: John Hubbard <[email protected]>
Cc: Anshuman Khandual <[email protected]>
Cc: Barry Song <[email protected]>
Cc: Catalin Marinas <[email protected]>
Cc: David Rientjes <[email protected]>
Cc: "Huang, Ying" <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: Itaru Kitayama <[email protected]>
Cc: Kirill A. Shutemov <[email protected]>
Cc: Luis Chamberlain <[email protected]>
Cc: Matthew Wilcox (Oracle) <[email protected]>
Cc: Vlastimil Babka <[email protected]>
Cc: Yang Shi <[email protected]>
Cc: Yin Fengwei <[email protected]>
Cc: Yu Zhao <[email protected]>
Cc: Zi Yan <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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