iommu: Add domain_has_cap iommu_ops
This iommu_op can tell if domain have a specific capability, like snooping control for Intel IOMMU, which can be used by other components of kernel to adjust the behaviour. Signed-off-by: NSheng Yang <sheng@linux.intel.com> Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>
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