ext4: Convert mpage_submit_page() to mpage_submit_folio()

All callers now have a folio so we can pass one in and use the folio
APIs to support large folios as well as save instructions by eliminating
calls to compound_head().

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Theodore Ts'o <tytso@mit.edu>
Link: https://lore.kernel.org/r/20230324180129.1220691-7-willy@infradead.org


Signed-off-by: Theodore Ts'o <tytso@mit.edu>