iommu/vt-d: Set domain type for a private domain

Otherwise, domain_get_iommu() will be broken.

Fixes: 942067f1b6 ("iommu/vt-d: Identify default domains replaced with private")
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

drivers/iommu/intel-iommu.c

@@ -3494,6 +3494,8 @@ static struct dmar_domain *get_private_domain_for_dev(struct device *dev)
 out:
 	if (!domain)
 		dev_err(dev, "Allocating domain failed\n");
+	else
+		domain->domain.type = IOMMU_DOMAIN_DMA;
 
 	return domain;
 }