kernel: Enable CONFIG_SQUASHFS_ZSTD and CONFIG_FW_CFG_SYSFS

[SeanDougherty]

Merge Checklist

All boxes should be checked before merging the PR (just tick any boxes which don't apply to this PR)

• The toolchain has been rebuilt successfully (or no changes were made to it)
• The toolchain/worker package manifests are up-to-date
• Any updated packages successfully build (or no packages were changed)
• Packages depending on static components modified in this PR (Golang, *-static subpackages, etc.) have had their Release tag incremented.
• Package tests (%check section) have been verified with RUN_CHECK=y for existing SPEC files, or added to new SPEC files
• All package sources are available
• cgmanifest files are up-to-date and sorted (./cgmanifest.json, ./toolkit/scripts/toolchain/cgmanifest.json, .github/workflows/cgmanifest.json)
• LICENSE-MAP files are up-to-date (./LICENSES-AND-NOTICES/SPECS/data/licenses.json, ./LICENSES-AND-NOTICES/SPECS/LICENSES-MAP.md, ./LICENSES-AND-NOTICES/SPECS/LICENSE-EXCEPTIONS.PHOTON)
• All source files have up-to-date hashes in the *.signatures.json files
• sudo make go-tidy-all and sudo make go-test-coverage pass
• Documentation has been updated to match any changes to the build system
• Ready to merge

---

Summary

CONFIG_SQUASHFS_ZSTD

• With this a better compression algo (zstd) becomes available to users, this is a read-only kernel feature with minimal overhead when not in use. Already enabled in our ARM kernel.

CONFIG_FW_CFG_SYSFS

• Enables module that permits firmware config injection. Minimal overhead, not loaded when not in use. Already enabled in our ARM kernel

Change Log

• Enable CONFIG_SQUASHFS_ZSTD
• Enable CONFIG_FW_CFG_SYSFS

Does this affect the toolchain?

NO

Associated issues

• ADO #17099

Test Methodology

• Pipeline build id: Buddy ID: 1037837
• Local install and boot
• kernel smoke tests
• sysbench comparison: nominal
• unixbench comparison: nominal

[rlmenge]