iommu/vt-d: Fix build error caused by unknown definition of acpi_handle

[Jiang Liu <jiang.liu@linux.intel.com>]

When both CONFIG_ACPI and CONFIG_DMAR_TABLE are disabled, commit
"Implement DMAR unit hotplug framework" causes build failure as below:
  CC      arch/x86/kernel/pci-dma.o
In file included from arch/x86/kernel/pci-dma.c:3:0:
include/linux/dmar.h:168:35: error: unknown type name ‘acpi_handle’
 static inline int dmar_device_add(acpi_handle handle)
                                   ^
include/linux/dmar.h:173:38: error: unknown type name ‘acpi_handle’
 static inline int dmar_device_remove(acpi_handle handle)
                                      ^
make[2]: *** [arch/x86/kernel/pci-dma.o] Error 1
make[1]: *** [arch/x86/kernel] Error 2
make: *** [arch/x86] Error 2

Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
---
Hi Joerg,
	Could you please help to merge or fold this patch to fix the
build error?
Regards!
Gerry
---
 include/linux/dmar.h |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/dmar.h b/include/linux/dmar.h
index 9c06bb4b5b14..594d4ac79e75 100644
--- a/include/linux/dmar.h
+++ b/include/linux/dmar.h
@@ -165,12 +165,12 @@ static inline int dmar_ir_hotplug(struct dmar_drhd_unit *dmaru, bool insert)
 
 #else /* CONFIG_DMAR_TABLE */
 
-static inline int dmar_device_add(acpi_handle handle)
+static inline int dmar_device_add(void *handle)
 {
 	return 0;
 }
 
-static inline int dmar_device_remove(acpi_handle handle)
+static inline int dmar_device_remove(void *handle)
 {
 	return 0;
 }
-- 
1.7.10.4