scsi: hisi_sas: improve int_chnl_int_v2_hw() consistency with v3 hw

Change code format of int_chnl_int_v2_hw() to be consistent with v3 hw to
reduce an tag indent.

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