libvirt: add viommu device to guest

Registered by Rico Lin

Add vIOMMU device configurable to libvirt guest

This isn't that useful by itself since every device in the guest is
still in the same (virtual) IOMMU group.
To fix that, we will need to
generate a full PCIe topology for the guest and add multiple PCIe
bridges [1]. This is a start in the right direction though.

[1] https://www.berrange.com/posts/2017/02/16/setting-up-a-nested-kvm-guest-for-developing-testing-pci-device-assignment-with-numa/

Blueprint information

Status:
Complete
Approver:
Stephen Finucane
Priority:
Undefined
Drafter:
Rico Lin
Direction:
Approved
Assignee:
Rico Lin
Definition:
Approved
Series goal:
Accepted for zed
Implementation:
Implemented
Milestone target:
None
Started by
Sylvain Bauza
Completed by
Rico Lin

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[20220614 bauzas] Spec was approved for the Zed cycle https://review.opendev.org/c/openstack/nova-specs/+/840310

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