tests: flesh out the AMD Genoa host vs guest test

[pb8o]

Changes

Record the differences with AMD Milan CPU.

Reason

License Acceptance

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the terms of the Apache 2.0 license. For more information on following Developer
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CONTRIBUTING.md.

PR Checklist

• I have read and understand CONTRIBUTING.md.
• I have run tools/devtool checkstyle to verify that the PR passes the
  automated style checks.
• I have described what is done in these changes, why they are needed, and
  how they are solving the problem in a clear and encompassing way.
• I have updated any relevant documentation (both in code and in the docs)
  in the PR.
• I have mentioned all user-facing changes in CHANGELOG.md.
• If a specific issue led to this PR, this PR closes the issue.
• When making API changes, I have followed the
  Runbook for Firecracker API changes.
• I have tested all new and changed functionalities in unit tests and/or
  integration tests.
• I have linked an issue to every new TODO.

---

• This functionality cannot be added in rust-vmm.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.07%. Comparing base (db2e270) to head (067c723).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4947   +/-   ##
=======================================
  Coverage   84.07%   84.07%           
=======================================
  Files         251      251           
  Lines       28059    28059           
=======================================
  Hits        23592    23592           
  Misses       4467     4467           

Flag	Coverage Δ
5.10-c5n.metal	84.65% <ø> (+<0.01%)	⬆️
5.10-m5n.metal	84.63% <ø> (+<0.01%)	⬆️
5.10-m6a.metal	83.94% <ø> (ø)
5.10-m6g.metal	80.74% <ø> (ø)
5.10-m6i.metal	84.62% <ø> (ø)
5.10-m7g.metal	80.74% <ø> (ø)
6.1-c5n.metal	84.65% <ø> (ø)
6.1-m5n.metal	84.63% <ø> (+<0.01%)	⬆️
6.1-m6a.metal	83.93% <ø> (ø)
6.1-m6g.metal	80.74% <ø> (-0.01%)	⬇️
6.1-m6i.metal	84.62% <ø> (ø)
6.1-m7g.metal	80.74% <ø> (ø)

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