mpt3sas: Use alloc_ordered_workqueue() API instead of create_singlethread_workqueue() API

Created a thread using alloc_ordered_workqueue() API in order to process
the works from firmware Work-queue sequentially instead of
create_singlethread_workqueue() API.
Signed-off-by: Sreekanth Reddy <Sreekanth.Reddy@avagotech.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Joe Lawrence <joe.lawrence@stratus.com>
Signed-off-by: James Bottomley <JBottomley@Odin.com>

drivers/scsi/mpt3sas/mpt3sas_scsih.c

@@ -8026,8 +8026,8 @@ _scsih_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	/* event thread */
 	snprintf(ioc->firmware_event_name, sizeof(ioc->firmware_event_name),
 	    "fw_event%d", ioc->id);
-	ioc->firmware_event_thread = create_singlethread_workqueue(
-	    ioc->firmware_event_name);
+	ioc->firmware_event_thread = alloc_ordered_workqueue(
+	    ioc->firmware_event_name, WQ_MEM_RECLAIM);
 	if (!ioc->firmware_event_thread) {
 		pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
 		    ioc->name, __FILE__, __LINE__, __func__);