x86: make only GART code include gart.h

gart.h has only GART-specific stuff. Only GART code needs it. Other
IOMMU stuff should include iommu.h instead of gart.h.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Acked-by: Muli Ben-Yehuda <muli@il.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
index 8467ec2..f581a4b 100644
--- a/arch/x86/kernel/pci-dma.c
+++ b/arch/x86/kernel/pci-dma.c
@@ -5,7 +5,7 @@
 
 #include <asm/proto.h>
 #include <asm/dma.h>
-#include <asm/gart.h>
+#include <asm/iommu.h>
 #include <asm/calgary.h>
 #include <asm/amd_iommu.h>