[Arm] Cleanup unused functions

[per]

Remove functions not used for searching/finding quantization information.

cc @digantdesai @freddan80 @zingo @oscarandersson8218

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/7725

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❌ 2 New Failures

As of commit 0d3ef2b with merge base fedb035 ():

NEW FAILURES - The following jobs have failed:

• pull / test-phi-3-mini-runner-linux / linux-job (gh)
  RuntimeError: Command docker exec -t bffca7da21dde9defa22c9b5d25cc0802d0d8ff3b8530053ab3d3e6ce3837805 /exec failed with exit code 2
• trunk / test-models-macos (cmake, emformer_transcribe, xnnpack-quantization-delegation, macos-m1-stable, 90) / macos-job (gh)
  RuntimeError: Missing out variants: {'quantized_decomposed::dequantize_per_tensor', 'quantized_decomposed::quantize_per_tensor'}

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[digantdesai]

@per do you want to push again to re-run the CI?

[zingo]

macos and phi test error seems unrelated to this PR (and fails in other PR)