Add ACPI support for x86_64

[bchalios]

Changes

Introduce ACPI support for x86_64.

Reason

Introducing ACPI will let us do a couple of things:

• Get rid of the i8042 (minimal) emulation. We will be able to shutdown by means of the S5 state. When/If we integrate ACPI for ARM, we will be able to shutdown properly on ARM as well
• Allow declaring devices without injecting slugs in kernel's command line.
• ACPI is necessary if we want to introduce support for PCIe
• Possible enabler for device/cpu/mem hotplugging
• Possible enabler for expressing NUMA topologies

Closes #2493

License Acceptance

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

PR Checklist

• [ ] All commits in this PR are signed (git commit -s).
• [ ] If a specific issue led to this PR, this PR closes the issue.
• [ ] The description of changes is clear and encompassing.
• [ ] Any required documentation changes (code and docs) are included in this PR.
• [ ] New unsafe code is documented.
• [ ] API changes follow the Runbook for Firecracker API changes.
• [ ] User-facing changes are mentioned in CHANGELOG.md.
• [ ] All added/changed functionality is tested.

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• [ ] This functionality can be added in rust-vmm.

[bchalios]

Mostly a note to self, we need to update ci artifacts with kernels that include ACPI support. Otherwise we'll keep seeing the CI failing.

[bchalios]

Closing this in favour of #4428. This other one is based on this one, but rebased on top of our current main