Arm backend: Add requirements.txt for arm backend

[perheld]

Add requirements.txt files to handle pip installs in a more python way of doing things. Tagged versions handled in one place instead of being spread out in shell scripts.

Requirements-arm-tosa.txt contains what is needed for the tosa reference model which is shared between multiple backends.

Requirements-arm-ethos-u.txt contains the vela compiler needed by the ethos-u backend.

Requirements-arm-models-test.txt contains test models needed for baremetal tests. The install_models_for_test.sh was keept since that its used by gitlab ci.

Change-Id: I3213e543d15c23b96ccd1f683a9d6c7b164d7e7b
Signed-off-by: per.held@arm.com

[pytorch-bot]

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• ROCm MI2xx CI/CD workflows failing due to : download from https://api.github.com/repos/pytorch/pytorch timed out.

❌ 3 New Failures, 1 Cancelled Job, 2 Unrelated Failures

As of commit 9d868ef with merge base 389918b ():

NEW FAILURES - The following jobs have failed:

• Build documentation / build (buck2) / Build doc (gh)
  At least one of the pre-conditions you specified did not hold
• trunk / test-llama-runner-mac (fp32, xnnpack+custom+quantize_kv) / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 2
• trunk / test-llama-torchao-lowbit / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 2

CANCELLED JOB - The following job was cancelled. Please retry:

• trunk / test-models-macos-cpu (emformer_join, xnnpack-quantization-delegation) / macos-job (gh)
  ##[error]The operation was canceled.

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-llama-runner-mac (fp32, coreml) / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 2
• trunk / test-llama-runner-mac (fp32, mps) / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 2

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[zingo]

Testa fails are unrelated