No longer need generateFromPos API

[kirklandsign]

Summary

Just use generate()

Test plan

CI

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/14101

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❌ 1 New Failure, 55 Pending

As of commit f6f69b4 with merge base 9fa1b27 ():

NEW FAILURE - The following job has failed:

• trunk / test-huggingface-transformers-macos (bert|coreml_fp32_gpu|--quantize) / macos-job (gh)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 1

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