x86/amd-iommu: Select PCI_IOV with AMD IOMMU driver

In order to support ATS in the AMD IOMMU driver this patch
makes sure that the generic support for ATS is compiled in.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

arch/x86/Kconfig

@@ -690,6 +690,7 @@ config AMD_IOMMU
 	bool "AMD IOMMU support"
 	select SWIOTLB
 	select PCI_MSI
+	select PCI_IOV
 	depends on X86_64 && PCI && ACPI
 	---help---
 	  With this option you can enable support for AMD IOMMU hardware in