This has callers of submit_bio/submit_bio_wait set the bio->bi_rw
instead of passing it in. This makes that use the same as
generic_make_request and how we set the other bio fields.
Signed-off-by: Mike Christie <mchristi@redhat.com>

Fixed up fs/ext4/crypto.c
Signed-off-by: Jens Axboe <axboe@fb.com>