nvme/012,013,035: change fio I/O size and move size definition place

nvme/012,013,035: change fio I/O size and move size definition place

Change fio I/O size of nvme/012,013,035 from 950m to 900m, since recent change
increased the xfs log size and it caused fio failure with I/O size 950m.

Also add size parameter to _run_fio_verify_io. This allows to move the fio I/O
size definition from common/xfs to the test case, so that device size and fio
I/O size are both defined at single place.

Link: https://lore.kernel.org/linux-block/20221019051244.810755-1-yi.zhang@redhat.com/
Signed-off-by: Yi Zhang <yi.zhang@redhat.com>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>