blk-mq: remove REQ_END

Pass an explicit parameter for the last request in a batch to ->queue_rq
instead of using a request flag.  Besides being a cleaner and non-stateful
interface this is also required for the next patch, which fixes the blk-mq
I/O submission code to not start a time too early.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>

diff --cc block/blk-mq.c
Simple merge

diff --cc drivers/block/mtip32xx/mtip32xx.c
Simple merge

diff --cc drivers/block/null_blk.c
Simple merge

diff --cc drivers/block/virtio_blk.c
Simple merge

diff --cc drivers/scsi/scsi_lib.c
Simple merge

diff --cc include/linux/blk-mq.h
Simple merge

diff --cc include/linux/blk_types.h
Simple merge