mm: make folio_pte_batch available outside of mm/memory.c

madvise, mprotect and some others might need folio_pte_batch to check if a
range of PTEs are completely mapped to a large folio with contiguous
physical addresses.  Let's make it available in mm/internal.h.

While at it, add proper kernel doc and sanity-check more input parameters
using two additional VM_WARN_ON_FOLIO().

[[email protected]: build fix]
  Link: https://lkml.kernel.org/r/CAGsJ_4wWzG-37D82vqP_zt+Fcbz+URVe5oXLBc4M5wbN8A_gpQ@mail.gmail.com
[[email protected]: improve the doc for the exported func]
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: David Hildenbrand <[email protected]>
Signed-off-by: Barry Song <[email protected]>
Suggested-by: David Hildenbrand <[email protected]>
Reviewed-by: Ryan Roberts <[email protected]>
Acked-by: David Hildenbrand <[email protected]>
Cc: Lance Yang <[email protected]>
Cc: Yin Fengwei <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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