x86/amd-iommu: Un__init function required on shutdown
The function iommu_feature_disable is required on system
shutdown to disable the IOMMU but it is marked as __init.
This may result in a panic if the memory is reused. This
patch fixes this bug.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
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