Revert "block: all blk-mq requests are tagged"

Revert "block: all blk-mq requests are tagged"

commit e999dbc254044e8d2a5818d92d205f65bae28f37 upstream.

This reverts commit fb3ccb5da71273e7f0d50b50bc879e50cedd60e7.

SCSI-2/SPI actually needs the tagged/untagged flag in the request to
work properly.  Revert this patch and add a follow on to set it in
the right place.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Acked-by: Jens Axboe <axboe@kernel.dk>
Reported-by: Meelis Roos <mroos@linux.ee>
Tested-by: Meelis Roos <mroos@linux.ee>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>