fix #27365977

It enables AMD_IOMMU for AMD platforms which support X2APIC.
Because AMD IOMMU driver initializes OMMU protection domains as
direct map, IOMMU_DEFAULT_PASSTHROUGH is needed.
Signed-off-by: NArtie Ding <artie.ding@linux.alibaba.com>
Reviewed-by: NShile Zhang <shile.zhang@linux.alibaba.com>
Acked-by: NCaspar Zhang <caspar@linux.alibaba.com>