mm/damon/vaddr: support folio of neither HPAGE_PMD_SIZE nor PAGE_SIZE

DAMON virtual address space monitoring operations set treats folios having
non-HPAGE_PMD_SIZE size as having PAGE_SIZE size.  Use the exact size of
the folio.

Link: https://lkml.kernel.org/r/20230109213335.62525-3-sj@kernel.org


Signed-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>