[easy] cmake-format CMakeLists.txt

[swolchok]

It wasn't format-clean.

[swolchok]

Stack from ghstack (oldest at bottom):

• Use CMake EXPORT #8954
• Convert pthreadpool to ExternalProject #12468
• Build XNNPACK as an ExternalProject #12425
• Format CMakeLists.txt files about to be changed in EXPORT PR #12463
• [easy] cmake-format extension/training/CMakeLists.txt #12451
• -> [easy] cmake-format CMakeLists.txt #12450

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/12450

• 📄 Preview Python docs built from this PR

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❌ 2 New Failures, 1 Unrelated Failure

As of commit ddc3705 with merge base dd4488d ():

NEW FAILURES - The following jobs have failed:

• Build documentation / build (buck2) / Build doc (gh)
• pull / test-eval_llama-mmlu-linux / linux-job (gh)
  RuntimeError: Command docker exec -t f5b8244f2a17ecbbfa690fd26aeda7398758a6337ba1b5e9d98a5e2c57c5b612 /exec failed with exit code 1

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• pull / test-models-linux (add_mul, portable, linux.2xlarge) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

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