mm: avoid use of VMA_SPECIAL_FLAGS in migrate_vma_setup()

Now we have the expressive vma_is_mm_backed() predicate, use it to
determine whether to proceed with migration. This drops the VMA_IO_BIT
test, which is safe as mm-managed mappings may not set it.

hugetlb mappings are mm-backed but remain explicitly excluded, as the
migrate_vma page walk has no hugetlb support.

No functional change intended.

Link: https://lore.kernel.org/20261013-b4-mmap-prepare-vma-flag-sanify-v6-36-1aa3c9b139f9@kernel.org
Signed-off-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
Cc: Liam R. Howlett <liam@infradead.org>
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