x86/64: Enable IOMMU_V2 support for later CPUs

Support newer IOMMU_V2 on AMD platforms, useful for DPDK and KVM.

Signed-off-by: Philip Prindeville <[email protected]>

target/linux/x86/64/config-5.15

@@ -42,7 +42,7 @@ CONFIG_AGP_INTEL=y
 # CONFIG_AGP_SIS is not set
 # CONFIG_AGP_VIA is not set
 CONFIG_AMD_IOMMU=y
-# CONFIG_AMD_IOMMU_V2 is not set
+CONFIG_AMD_IOMMU_V2=y
 # CONFIG_AMD_PMC is not set
 # CONFIG_AMD_PTDMA is not set
 # CONFIG_AMD_SFH_HID is not set