iommu/vt-d: Use for_each_drhd_unit() instead of list_for_each_entry()

Use for_each_drhd_unit() instead of list_for_each_entry for
better readability.

Signed-off-by: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Joerg Roedel <joro@8bytes.org>
diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c
index 785675a..da2d0d9 100644
--- a/drivers/iommu/dmar.c
+++ b/drivers/iommu/dmar.c
@@ -403,7 +403,7 @@
 
 	dev = pci_physfn(dev);
 
-	list_for_each_entry(dmaru, &dmar_drhd_units, list) {
+	for_each_drhd_unit(dmaru) {
 		drhd = container_of(dmaru->hdr,
 				    struct acpi_dmar_hardware_unit,
 				    header);