FROMLIST: Revert "iommu/arm-smmu: Make arm-smmu-v3 explicitly non-modular"

This reverts commit c07b6426.

Let's get the SMMUv3 driver building as a module, which means putting
back some dead code that we used to carry.

Signed-off-by: Will Deacon <will@kernel.org>
Bug: 140290589
Link: https://lore.kernel.org/lkml/20191121114918.2293-8-will@kernel.org/


Signed-off-by: Will Deacon <willdeacon@google.com>
Change-Id: Ifde3c5dc81a0db600532b305906c67aa065d2f47