iommu: Add missing forward declaration in include file
The 'struct notifier_block' is not used in linux/iommu.h but not declared anywhere. Add a forward declaration for it. Reported-by: NThierry Reding <thierry.reding@avionic-design.de> Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>
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