mm: mempolicy: use folio_alloc_mpol() in alloc_migration_target_by_mpol()

Convert to use folio_alloc_mpol() to make vma_alloc_folio_noprof() to use
folio throughout.

Link: https://lkml.kernel.org/r/20240515070709.78529-4-wangkefeng.wang@huawei.com


Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>