iommu: Implement generic_iommu_put_resv_regions()
Implement a generic function for removing reserved regions. This can be used by drivers that don't do anything fancy with these regions other than allocating memory for them. Signed-off-by: NThierry Reding <treding@nvidia.com> Signed-off-by: NJoerg Roedel <jroedel@suse.de>
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