Now that PCI inbound window restrictions are handled generically between
the of_pci resource parsing and the IOMMU layer, and described in the
Juno DT, we can finally enable the PCIe SMMU without the risk of DMA
mappings inadvertently allocating unusable addresses.

Similarly, the relevant support for IOMMU mappings for peripheral
transfers has been hooked up in the pl330 driver for ages, so we can
happily enable the DMA SMMU without that breaking anything either.

Link: https://lore.kernel.org/r/a730070d718cb119f77c8ca1782a0d4189bfb3e7.1614965598.git.robin.murphy@arm.comSigned-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>