Codeql: fix circular import betweeen accelerator and system_config

[guotuofeng]

Describe your changes

• Fix codeql https://github.com/microsoft/Olive/security/code-scanning/10641

Checklist before requesting a review

• Add unit tests for this change.
• Make sure all tests can pass.
• Update documents if necessary.
• Lint and apply fixes to your code by running lintrunner -a
• Is this a user-facing change? If yes, give a description of this change to be included in the release notes.
• Is this PR including examples changes? If yes, please remember to update example documentation in a follow-up PR.

(Optional) Issue link