sg: add support for WRITE STREAM(16) commands

sg: add support for WRITE STREAM(16) commands

Add the "write_stream" option to sg_write_mode to send WRITE STREAM(16)
commands. Use the new stream_id option to set the stream identifier.

Example:

sg_stream_ctl -o /dev/sdb
Assigned stream id: 1
./fio --name=test --filename=/dev/sdb --ioengine=sg --sg_write_mode=write_stream --stream_id=1 --rw=randwrite --time_based --runtime=10s
...
sg_stream_ctl -c --id=1 /dev/sdb

Signed-off-by: Vincent Fu <vincent.fu@samsung.com>
Link: https://lore.kernel.org/r/20211115200807.117138-5-vincent.fu@samsung.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>