Remove op_common.py in Arm-backend

[oscarandersson8218]

backends/arm/operators/op_common.py was used as a utils-file, but named as an op. Functions are moved backends/arm/tosa_utils.py.

[pytorch-bot[bot]]

:link: Helpful Links

:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/3972

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:x: 4 New Failures

As of commit a3e7c1156d2835a168f61d6e6276534817c8ea88 with merge base 089858b34d7d5418864d56f30e6e16fcf0d26fe1 ():

NEW FAILURES - The following jobs have failed:

* [trunk / test-models-macos (cmake, add_mul, xnnpack-quantization-delegation, macos-m1-stable, 90) / macos-job](https://hud.pytorch.org/pr/pytorch/executorch/3972#26220981969) ([gh](https://github.com/pytorch/executorch/actions/runs/9512616433/job/26220981969)) `##[error]The operation was canceled.` * [trunk / test-models-macos (cmake, llama2, portable, macos-m1-stable, 90) / macos-job](https://hud.pytorch.org/pr/pytorch/executorch/3972#26220991505) ([gh](https://github.com/pytorch/executorch/actions/runs/9512616433/job/26220991505)) `##[error]The operation was canceled.` * [trunk / test-models-macos (cmake, resnet18, xnnpack-quantization-delegation, macos-m1-stable, 90) / macos-job](https://hud.pytorch.org/pr/pytorch/executorch/3972#26220994069) ([gh](https://github.com/pytorch/executorch/actions/runs/9512616433/job/26220994069)) `##[error]The operation was canceled.` * [trunk / test-models-macos (cmake, softmax, portable, macos-m1-stable, 90) / macos-job](https://hud.pytorch.org/pr/pytorch/executorch/3972#26220995010) ([gh](https://github.com/pytorch/executorch/actions/runs/9512616433/job/26220995010)) `##[error]The operation was canceled.`

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[digantdesai]

rebase once #3971 to get a clean CI? Thanks

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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 pytorch/executorch@7c0f4c2b6f87369ee20544aada33dc55078c6bc6.