x86: remove duplicated extern force_iommu
Both iommu.h and dma-mapping.h have extern force_iommu. The latter doesn't need to do. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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2797982e
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