iommu/amd: Remove local PCI_BUS() define and use PCI_BUS_NUM() from PCI

Change to remove local PCI_BUS() define and use the new PCI_BUS_NUM()
interface from PCI.

Signed-off-by: Shuah Khan <shuah.khan@hp.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Joerg Roedel <joro@8bytes.org>
diff --git a/drivers/iommu/amd_iommu_types.h b/drivers/iommu/amd_iommu_types.h
index e38ab43..a07882f 100644
--- a/drivers/iommu/amd_iommu_types.h
+++ b/drivers/iommu/amd_iommu_types.h
@@ -24,6 +24,7 @@
 #include <linux/mutex.h>
 #include <linux/list.h>
 #include <linux/spinlock.h>
+#include <linux/pci.h>
 
 /*
  * Maximum number of IOMMUs supported
@@ -315,9 +316,6 @@
 
 #define MAX_DOMAIN_ID 65536
 
-/* FIXME: move this macro to <linux/pci.h> */
-#define PCI_BUS(x) (((x) >> 8) & 0xff)
-
 /* Protection domain flags */
 #define PD_DMA_OPS_MASK		(1UL << 0) /* domain used for dma_ops */
 #define PD_DEFAULT_MASK		(1UL << 1) /* domain is a default dma_ops