The function populates the list of reserved regions with the
PCI host bridge windows and the MSI IOVA range.

At the moment an arbitray MSI IOVA window is set at 0x8000000
of size 1MB.

Signed-off-by: Eric Auger <eric.auger@redhat.com>

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RFC v1 -> v2: use defines for MSI IOVA base and length