mm: allow non-hugetlb large folios to be batch processed

Hugetlb folios still get special treatment, but normal large folios can
now be freed by free_unref_folios().  This should have a reasonable
performance impact, TBD.

Link: https://lkml.kernel.org/r/20240227174254.710559-11-willy@infradead.org


Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Ryan Roberts <ryan.roberts@arm.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Mel Gorman <mgorman@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>