iommu/vt-d, trivial: simplify code with existing macros
Simplify vt-d related code with existing macros and introduce a new macro for_each_active_drhd_unit() to enumerate all active DRHD unit. Signed-off-by: NJiang Liu <jiang.liu@linux.intel.com> Signed-off-by: NJoerg Roedel <joro@8bytes.org>
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