jfs: Convert metapage_read_folio to use folio APIs

Use bio_add_folio_nofail() as we just allocated the bio and know
it cannot fail.  Other than that, this is a 1:1 conversion from
page APIs to folio APIs.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>