remove extra torchao commit pin

[metascroy]

In #6195, we removed references to the torchao commit pin and used a submodule instead. This removes the commit pin from the repo.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/6784

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❌ 3 New Failures

As of commit dbc0d7f with merge base 2f6d64f ():

NEW FAILURES - The following jobs have failed:

• Apple / build-benchmark-app / macos-job (gh)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 1
• Apple / build-demo-ios / macos-job (gh)
• Apple / upload-frameworks-ios (gh)
  ##[error]Credentials could not be loaded, please check your action inputs: Could not load credentials from any providers

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