FROMLIST: iommu/arm-smmu-v3: Allow building as a module

By removing the redundant call to 'pci_request_acs()' we can allow the
ARM SMMUv3 driver to be built as a module.

Signed-off-by: Will Deacon <will@kernel.org>
Bug: 140290589
Link: https://lore.kernel.org/lkml/20191121114918.2293-12-will@kernel.org/


Signed-off-by: Will Deacon <willdeacon@google.com>
Change-Id: I1d8fbe26ab7114af6409ea13a68fff8afed49703