scsi: pm80xx: Display proc_name in sysfs

The proc_name entry in sysfs for pm80xx is "(null)" because it is not
initialized in scsi_host_template:

Before:
host:~# cat /sys/class/scsi_host/host6/proc_name
(null)

After:
host:~# cat /sys/class/scsi_host/host6/proc_name
pm80xx

Signed-off-by: Igor Pylypiv <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Reviewed-by: Jolly Shah <[e-mail]>
Acked-by: Jack Wang <[e-mail]>
Signed-off-by: Martin K. Petersen <[e-mail]>

drivers/scsi/pm8001/pm8001_init.c

···
 static struct scsi_host_template pm8001_sht = {
 	.module			= THIS_MODULE,
 	.name			= DRV_NAME,
+	.proc_name		= DRV_NAME,
 	.queuecommand		= sas_queuecommand,
 	.dma_need_drain		= ata_scsi_dma_need_drain,
 	.target_alloc		= sas_target_alloc,