iommu/arm-smmu: Allow building as a module
By conditionally dropping support for the legacy binding and exporting the newly introduced 'arm_smmu_impl_init()' function we can allow the ARM SMMU driver to be built as a module. Signed-off-by: Will Deacon <will@kernel.org> Tested-by: John Garry <john.garry@huawei.com> # smmu v3 Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Joerg Roedel <jroedel@suse.de>
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