scsi: hisi_sas: fix PI memory size

There are 28 bytes of protection information record of SSP for v3 hw, 16
bytes for v2 hw, and probably 24 for v1 hw (forgotten now).

So use a value big enough in hisi_sas_command_table_ssp.prot to cover
all cases.

Signed-off-by: Xiang Chen <chenxiang66@hisilicon.com>
Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>