erofs: convert z_erofs_submissionqueue_endio() to folios

Use bio_for_each_folio() to iterate over each folio in the bio and
there is no large folios for now.

Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Link: https://lore.kernel.org/r/20240305091448.1384242-5-hsiangkao@linux.alibaba.com