Use 6.1 guest kernel configs from AL

[bchalios]

Changes

Use AmazonLinux tailored guest configs for our 6.1 guest microVM kernels. Also, split the Kconfig for our CI kernels in a base part which will always be reflecting the AmazonLinux config and a set of patches that we apply on top of it before rebuilding our CI kernels. The patches live under resources/guest_configs/patches/.

Reason

AmazonLinux now ships a microVM kernels for 6.1. We want to build with the corresponding Kconfigs and keep track of our CI-specific changes in a form of patches.

License Acceptance

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license. For more information on following Developer Certificate of Origin and signing off your commits, please check CONTRIBUTING.md.

PR Checklist

• [ ] 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.
• [ ] API changes follow the Runbook for Firecracker API changes.
• [ ] User-facing changes are mentioned in CHANGELOG.md.
• [ ] All added/changed functionality is tested.
• [ ] New TODOs link to an issue.
• [ ] Commits meet contribution quality standards.

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• [ ] This functionality cannot be added in rust-vmm.