Arm backend: Make memory pool sizes configrable from cmake

[zingo]

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[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/5841

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❌ 1 New Failure, 2 Unrelated Failures

As of commit ee30789 with merge base 13408b9 ():

NEW FAILURE - The following job has failed:

• trunk / test-models-macos (cmake, ic4, xnnpack-quantization-delegation, macos-m1-stable, 90) / macos-job (gh)
  Library not loaded: @rpath/liblz4.1.dylib

BROKEN TRUNK - The following jobs failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• trunk / test-coreml-delegate / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 1
• trunk / test-models-macos (cmake, llama2, xnnpack-delegation, macos-m1-stable, 90) / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1

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@mergennachin has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

[zingo]

The broken trunk regarding sigmoind for arm was caused by the Pythorch 2.5->2.6 update that was merged yesterday
Fix is here #5843
See #5832 for more info.
(e.g. unrelated to this PR)

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@digantdesai has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

[facebook-github-bot]

@digantdesai merged this pull request in cf18ced.