BACKPORT: mm: add free_unref_folios()

Iterate over a folio_batch rather than a linked list.  This is easier for
the CPU to prefetch and has a batch count naturally built in so we don't
need to track it.  Again, this lowers the maximum lock hold time from
32 folios to 15, but I do not expect this to have a significant effect.

Link: https://lkml.kernel.org/r/20240227174254.710559-4-willy@infradead.org


Change-Id: Ib5c121c102dfd302c72771645a0f751c1be23608
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: David Hildenbrand <david@redhat.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
(cherry picked from commit 90491d87)
Bug: 420771453
[ Move trace_android_vh_free_unref_page_list_bypass  into new
  free_unref_page_list() - Kalesh Singh ]
Signed-off-by: Kalesh Singh <kaleshsingh@google.com>