!1005 scsi: hisi_sas: A group of SAS-related bugfixes

Merge Pull Request from: @xia-bing1 
 
This series contain some fixes including:
  -Add slave_destroy interface for v3 hw
  -Try more retries of START_STOP when resuming scsi device
  -Block requests before take debugfs snapshot
  -Check usage count only when the runtime PM status is RPM_SUSPENDING 
 
Link:https://gitee.com/openeuler/kernel/pulls/1005

 

Reviewed-by: Yihang Li <liyihang9@huawei.com>
Signed-off-by: Jialin Zhang <zhangjialin11@huawei.com>