Goal: 

• Add functionality for live migration in 'host' TPM secret security mode (nova-compute can read TPM secret and pass it over RPC)

Important:

• This feature is not backportable – the redesign addressed issues of complexity and scope.

Acceptance Criteria:

Land the next two patches in the series [1]:

• TPM: support live migration of `host` secret security
  • https://review.opendev.org/c/openstack/nova/+/941483

• TPM: fixups for live migration of `host` secret security
  • https://review.opendev.org/c/openstack/nova/+/976316

[1] https://review.opendev.org/q/topic:%22bp/vtpm-live-migration%22+project:openstack/nova+-is:abandoned