Change Enable KleidiAI to default in CMake

[mcr229]

No description provided.

[mcr229]

Stack from ghstack (oldest at bottom):

• -> Change Enable KleidiAI to default in CMake #12452

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/12452

• 📄 Preview Python docs built from this PR

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❌ 4 New Failures, 1 Cancelled Job, 1 Unrelated Failure

As of commit 08ba626 with merge base dd4488d ():

NEW FAILURES - The following jobs have failed:

• Build Presets / linux (linux, linux.2xlarge, executorch-ubuntu-22.04-clang12) / build (gh)
  The runner has received a shutdown signal. This can happen when the runner service is stopped, or a manually started runner is canceled.
• Lint / link-check / lint-xrefs / linux-job (gh)
  The runner has received a shutdown signal. This can happen when the runner service is stopped, or a manually started runner is canceled.
• Lint / lintrunner / linux-job (gh)
  The runner has received a shutdown signal. This can happen when the runner service is stopped, or a manually started runner is canceled.
• pull / test-eval_llama-mmlu-linux / linux-job (gh)
  RuntimeError: Command docker exec -t d793b82f2c7992eb1453ad57674328d401ab0660d704e8a7e9d578d41fd4035d /exec failed with exit code 1

CANCELLED JOB - The following job was cancelled. Please retry:

• Build documentation / build (buck2) / Build doc (gh)
  The runner has received a shutdown signal. This can happen when the runner service is stopped, or a manually started runner is canceled.

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

• pull / test-static-llama-qnn-linux / linux-job (gh) (matched linux rule in flaky-rules.json)
  The runner has received a shutdown signal. This can happen when the runner service is stopped, or a manually started runner is canceled.

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