scsi: hisi_sas: Don't send bcast events from HW during nexus HA reset

Remote devices may go missing from the per-device nexus reset part of the
HA nexus, i.e after the controller reset. This is because libsas may find
the devices to be gone as the phy may be temporarily down when processing
the bcast event generated from the nexus reset. Filter out bcast events
during this time to stop the devices being lost.

Link: https://lore.kernel.org/r/1662378529-101489-6-git-send-email-john.garry@huawei.com


Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>