mm/swap: convert lru_deactivate to a folio_batch

Using folios instead of pages shrinks deactivate_page() and
lru_deactivate_fn() by 778 bytes between them.

Link: https://lkml.kernel.org/r/20220617175020.717127-7-willy@infradead.org


Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>