block: make rq->cmd_flags be 64-bit

We have officially run out of flags in a 32-bit space. Extend it
to 64-bit even on 32-bit archs.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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

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

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

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

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