scsi: hisi_sas: Modify v3 hw STP_LINK_TIMER setting

Modify STP link timer from 10ms to 500ms. Also add the register address.

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>