scsi: hisi_sas: add hisi_sas_clear_nexus_ha()

scsi: hisi_sas: add hisi_sas_clear_nexus_ha()

BugLink: https://bugs.launchpad.net/bugs/1695999
Add function for upper-layer to reset controller when all else fails.

Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Xiang Chen <chenxiang66@hisilicon.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
(cherry picked from commit 8b05ad6a9dbc4306c8eaf0f5269206647ed1ad7e)
Signed-off-by: dann frazier <dann.frazier@canonical.com>
Acked-by: Stefan Bader <stefan.bader@canonical.com>
Acked-by: Seth Forshee <seth.forshee@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>