x86: unify pci iommu setup and allow swiotlb to compile for 32 bit
swiotlb on 32 bit will be used by Xen domain 0 support. Signed-off-by: NIan Campbell <ian.campbell@citrix.com> Signed-off-by: NJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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