ACPI/IORT: Introduce iort_iommu_configure

DT based systems have a generic kernel API to configure IOMMUs
for devices (ie of_iommu_configure()).

On ARM based ACPI systems, the of_iommu_configure() equivalent can
be implemented atop ACPI IORT kernel API, with the corresponding
functions to map device identifiers to IOMMUs and retrieve the
corresponding IOMMU operations necessary for DMA operations set-up.

By relying on the iommu_fwspec generic kernel infrastructure,
implement the IORT based IOMMU configuration for ARM ACPI systems
and hook it up in the ACPI kernel layer that implements DMA
configuration for a device.

Signed-off-by: Lorenzo Pieralisi <[email protected]>
Acked-by: Rafael J. Wysocki <[email protected]> [ACPI core]
Reviewed-by: Tomasz Nowicki <[email protected]>
Tested-by: Hanjun Guo <[email protected]>
Tested-by: Tomasz Nowicki <[email protected]>
Cc: Hanjun Guo <[email protected]>
Cc: Tomasz Nowicki <[email protected]>
Cc: "Rafael J. Wysocki" <[email protected]>
Signed-off-by: Will Deacon <[email protected]>

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