For v3 hw, it supports DIF/DIX operation for SAS disks but not for SATA
disk. And it supports DIF CRC16.
To support it, need to alloc memory for PI, and fill some fields related
to DIF/DIX in DQ and protection iu.
Signed-off-by: NXiang Chen <chenxiang66@hisilicon.com>
Signed-off-by: NJohn Garry <john.garry@huawei.com>