[IA64] iommu: Add a dummy iommu_table.h file in IA64.

We don't need a comlex IOMMU dependency list on IA64 so
we just define the IOMMU_* macro as a dummy.
Signed-off-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: NTony Luck <tony.luck@intel.com>

arch/ia64/include/asm/iommu_table.h

+#ifndef _ASM_IA64_IOMMU_TABLE_H
+#define _ASM_IA64_IOMMU_TABLE_H
+
+#define IOMMU_INIT_POST(_detect)
+
+#endif /* _ASM_IA64_IOMMU_TABLE_H */