scsi: hisi_sas: fix v3 hw channel interrupt processing

The channel interrupt is to process all the interrupts except PHY
UP/DOWN and broadcast interrupt. So we need to clear all the interrupts
except those 3 interrupts after processing channel interrupts.

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>