iommu/arm-smmu-v3: Make the kunit into a module

It turns out kconfig has problems ensuring the SMMU module and the KUNIT
module are consistently y/m to allow linking. It will permit KUNIT to be a
module while SMMU is built in.

Also, Fedora apparently enables kunit on production kernels.

So, put the entire kunit in its own module using the
VISIBLE_IF_KUNIT/EXPORT_SYMBOL_IF_KUNIT machinery. This keeps it out of
vmlinus on Fedora and makes the kconfig work in the normal way. There is
no cost if kunit is disabled.

Fixes: 56e1a4cc2588 ("iommu/arm-smmu-v3: Add unit tests for arm_smmu_write_entry")
Reported-by: Thorsten Leemhuis <[email protected]>
Link: https://lore.kernel.org/all/[email protected]
Signed-off-by: Jason Gunthorpe <[email protected]>
Tested-by: Thorsten Leemhuis <[email protected]>
Acked-by: Will Deacon <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Joerg Roedel <[email protected]>

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