scsi: hisi_sas: modify some register config for hip08

Do some modifications for register configuring for hip08.

In future, to reduce kernel churn with patches to modify registers, any
registers which may change between board models (mostly PHY/SERDES related)
should be set in ACPI reset handler.

Signed-off-by: Xiaofei Tan <tanxiaofei@huawei.com>
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>