Fix lint in clang-format (#3041)

Summary:
Pull Request resolved: https://github.com/pytorch/executorch/pull/3041

We are updating to clang-formatter 18.

The current clang-format in coreml code has duplicate key. Deleting one of them.

See context D56139356

bypass-github-export-checks
bypass-github-pytorch-ci-checks
bypass-github-executorch-ci-checks

Reviewed By: cccclai

Differential Revision: D56139927

fbshipit-source-id: 937f58092abd6f695304ee2a5dd38bc4b8412ec0