iommu/amd: Process all IVHDs before enabling IOMMU features

The ACPI IVRS table can contain multiple IVHD blocks. Each block contains
information used to initialize each IOMMU instance.

Currently, init_iommu_all sequentially process IVHD block and initialize
IOMMU instance one-by-one. However, certain features require all IOMMUs
to be configured in the same way system-wide. In case certain IVHD blocks
contain inconsistent information (most likely FW bugs), the driver needs
to go through and try to revert settings on IOMMUs that have already been
configured.

A solution is to split IOMMU initialization into 3 phases:

Phase1 : Processes information of the IVRS table for all IOMMU instances.
This allow all IVHDs to be processed prior to enabling features.

Phase2 : Early feature support check on all IOMMUs (using information in
IVHD blocks.

Phase3 : Iterates through all IOMMU instances and enabling features.

Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>

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