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In preparation for deferring TLB flushes to iommu_tlb_sync(), introduce two new synchronous invalidation helpers to the io-pgtable API, which allow the unmap() code to force invalidation in cases where it cannot be deferred (e.g. when replacing a table with a block or when TLBI_ON_MAP is set). Signed-off-by: Will Deacon <will@kernel.org>