ioat: silence "dca disabled" messages

Turning off dca is not an "error", and the dca-enabled state can be
viewed from sysfs.
Signed-off-by: NDan Williams <dan.j.williams@intel.com>

drivers/dma/ioat/dca.c

@@ -98,7 +98,7 @@ static int dca_enabled_in_bios(struct pci_dev *pdev)
 	cpuid_level_9 = cpuid_eax(9);
 	res = test_bit(0, &cpuid_level_9);
 	if (!res)
-		dev_err(&pdev->dev, "DCA is disabled in BIOS\n");
+		dev_dbg(&pdev->dev, "DCA is disabled in BIOS\n");
 
 	return res;
 }
@@ -108,7 +108,7 @@ static int system_has_dca_enabled(struct pci_dev *pdev)
 	if (boot_cpu_has(X86_FEATURE_DCA))
 		return dca_enabled_in_bios(pdev);
 
-	dev_err(&pdev->dev, "boot cpu doesn't have X86_FEATURE_DCA\n");
+	dev_dbg(&pdev->dev, "boot cpu doesn't have X86_FEATURE_DCA\n");
 	return 0;
 }