mm: conditionally write-lock VMA in free_pgtables

Normally free_pgtables needs to lock affected VMAs except for the case
when VMAs were isolated under VMA write-lock.  munmap() does just that,
isolating while holding appropriate locks and then downgrading mmap_lock
and dropping per-VMA locks before freeing page tables.  Add a parameter to
free_pgtables for such scenario.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Suren Baghdasaryan <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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