x86: remove ifdef CONFIG_CALGARY_IOMMU in pci-dma.c

asm-x86/calgary.h has dummy calgary_iommu_init() and detect_calgary()
in !CONFIG_CALGARY_IOMMU case. So we don't need ifdef
CONFIG_CALGARY_IOMMU in pci-dma.c.
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Acked-by: Muli Ben-Yehuda <muli@il.ibm.com>
Cc: Alexis Bruemmer <alexisb@us.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86/kernel/pci-dma.c

@@ -116,9 +116,7 @@ void __init pci_iommu_alloc(void)
 	 */
 	gart_iommu_hole_init();
 
-#ifdef CONFIG_CALGARY_IOMMU
 	detect_calgary();
-#endif
 
 	detect_intel_iommu();
 
@@ -496,9 +494,7 @@ EXPORT_SYMBOL(dma_free_coherent);
 
 static int __init pci_iommu_init(void)
 {
-#ifdef CONFIG_CALGARY_IOMMU
 	calgary_iommu_init();
-#endif
 
 	intel_iommu_init();