Arm backend: Run only when tosa_reference_model is availalbe

[lucylq]

Summary: as title

Differential Revision: D78031934

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/12312

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❌ 1 New Failure, 2 Pending

As of commit 1f528b7 with merge base defa089 ():

NEW FAILURE - The following job has failed:

• pull / test-eval_llama-mmlu-linux / linux-job (gh)
  RuntimeError: Command docker exec -t fbf9b1a5109a106738a4bdd5f6e131d3ac7ac0d1d702a213b71958798807e7f5 /exec failed with exit code 1

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[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D78031934

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[digantdesai]

Looks great. Amazing! Great :-p

[YufengShi-dudu]

Thanks for fixing!