dmaengine: Replace WARN_TAINT_ONCE() with pr_warn_once()

The WARN_TAINT_ONCE() prints out a loud stack trace on broken BIOSes.
The systems that have this problem are several years out of support and
no longer have BIOS updates available.  The stack trace isn't necessary
and a pr_warn_once() will do.

Change WARN_TAINT_ONCE() to pr_warn_once() and taint.
Signed-off-by: Prarit Bhargava <prarit@redhat.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Vinod Koul <vinod.koul@intel.com>
Cc: Duyck, Alexander H <alexander.h.duyck@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

drivers/dma/ioat/dca.c

@@ -336,10 +336,10 @@ struct dca_provider *ioat_dca_init(struct pci_dev *pdev, void __iomem *iobase)
 	}
 
 	if (dca3_tag_map_invalid(ioatdca->tag_map)) {
-		WARN_TAINT_ONCE(1, TAINT_FIRMWARE_WORKAROUND,
-				"%s %s: APICID_TAG_MAP set incorrectly by BIOS, disabling DCA\n",
-				dev_driver_string(&pdev->dev),
-				dev_name(&pdev->dev));
+		add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK);
+		pr_warn_once("%s %s: APICID_TAG_MAP set incorrectly by BIOS, disabling DCA\n",
+			     dev_driver_string(&pdev->dev),
+			     dev_name(&pdev->dev));
 		free_dca_provider(dca);
 		return NULL;
 	}