cciss: set SCSI max cmd len to 16, as default is wrong

Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Cc: Mike Miller <mikem@beardog.cce.hp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>