mm: Reduce the number of slab->folio casts

Mark a few more folio functions as taking a const folio pointer, which
allows us to remove a few places in slab which cast away the const.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>