scsi: hisi_sas: Adjust priority of registering and exiting debugfs for security

To be safe, we should register debugfs at the last stage of driver
initialization and then unregister debugfs at the first stage of driver
uninstallation.

Signed-off-by: Yihang Li <liyihang9@huawei.com>
Link: https://lore.kernel.org/r/20241008021822.2617339-2-liyihang9@huawei.com


Reviewed-by: Xiang Chen <chenxiang66@hisilicon.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>