Revert "Add SmolLM (smollm2) (#9354)"

[jackzhxng]

This reverts commit d60173b (PR - #9354) which was accidentally merged directly into viable/extrict instead of main.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/9540

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❌ 1 New Failure

As of commit d2757b8 with merge base 01a22b6 ():

NEW FAILURE - The following job has failed:

• pull / unittest-buck / macos / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 3

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