scsi: hisi_sas: Display proc_name in sysfs

The 'proc_name' entry in sysfs for hisi_sas is 'null' now because it is not
initialized in scsi_host_template. It looks like:

[root@localhost ~]# cat /sys/class/scsi_host/host2/proc_name
(null)

While the other driver's entry looks like:

linux-vnMQMU:~ # cat /sys/class/scsi_host/host0/proc_name
megaraid_sas

Link: https://lore.kernel.org/r/20200512113258.30781-1-yanaijie@huawei.com
Cc: John Garry <john.garry@huawei.com>
Cc: Xiang Chen <chenxiang66@hisilicon.com>
Acked-by: John Garry <john.garry@huawei.com>
Signed-off-by: Jason Yan <yanaijie@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/hisi_sas/hisi_sas_v1_hw.c

@@ -1757,6 +1757,7 @@ static struct device_attribute *host_attrs_v1_hw[] = {
 
 static struct scsi_host_template sht_v1_hw = {
 	.name			= DRV_NAME,
+	.proc_name		= DRV_NAME,
 	.module			= THIS_MODULE,
 	.queuecommand		= sas_queuecommand,
 	.target_alloc		= sas_target_alloc,

drivers/scsi/hisi_sas/hisi_sas_v2_hw.c

@@ -3533,6 +3533,7 @@ static struct device_attribute *host_attrs_v2_hw[] = {
 
 static struct scsi_host_template sht_v2_hw = {
 	.name			= DRV_NAME,
+	.proc_name		= DRV_NAME,
 	.module			= THIS_MODULE,
 	.queuecommand		= sas_queuecommand,
 	.target_alloc		= sas_target_alloc,

drivers/scsi/hisi_sas/hisi_sas_v3_hw.c

@@ -3071,6 +3071,7 @@ static int debugfs_set_bist_v3_hw(struct hisi_hba *hisi_hba, bool enable)
 
 static struct scsi_host_template sht_v3_hw = {
 	.name			= DRV_NAME,
+	.proc_name		= DRV_NAME,
 	.module			= THIS_MODULE,
 	.queuecommand		= sas_queuecommand,
 	.target_alloc		= sas_target_alloc,