[0.6 release][ez] fix unittest-arm

[SS-JIA]

Summary

As title. For some reason, there are two tests which fail on main but pass on release branch. Therefore, remove expected failures from the test.

Test plan

Ran the test_torch_functions.py test locally.

(executorch) ssjia@devvm5117 ~/scratch/executorch (ssj_release_fix_arm_tests●)$ pytest backends/arm/test/models/test_torch_functions.py
===================================================================================================== test session starts =====================================================================================================
platform linux -- Python 3.10.0, pytest-8.0.1, pluggy-1.4.0
rootdir: /home/ssjia/scratch/executorch/backends/arm/test
configfile: pytest.ini
plugins: anyio-4.6.0, hypothesis-6.98.10, xdist-3.5.0, rerunfailures-15.0
collected 20 items                                                                                                                                                                                                            

backends/arm/test/models/test_torch_functions.py .....xx.xx......x.xx                                                                                                                                                   [100%]

====================================================================================================== warnings summary =======================================================================================================
../../anaconda3/envs/executorch/lib/python3.10/site-packages/executorch/exir/dialects/edge/_ops.py:9
  /home/ssjia/anaconda3/envs/executorch/lib/python3.10/site-packages/executorch/exir/dialects/edge/_ops.py:9: DeprecationWarning: pkg_resources is deprecated as an API. See https://setuptools.pypa.io/en/latest/pkg_resources.html
    import pkg_resources

../../anaconda3/envs/executorch/lib/python3.10/site-packages/executorch/extension/pybindings/portable_lib.py:20
  /home/ssjia/anaconda3/envs/executorch/lib/python3.10/site-packages/executorch/extension/pybindings/portable_lib.py:20: ExperimentalWarning: This API is experimental and subject to change without notice.
    _warnings.warn(

-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
========================================================================================= 13 passed, 7 xfailed, 2 warnings in 32.29s ==========================================================================================

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/10114

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❌ 1 New Failure, 1 Cancelled Job

As of commit 8a32ecd with merge base 771588a ():

NEW FAILURE - The following job has failed:

• trunk / test-coreml-delegate / macos-job (gh)
  Library not loaded: @rpath/liblz4.1.dylib

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

• trunk / test-models-macos (mv3, xnnpack-quantization-delegation) / macos-job (gh)
  ##[error]The operation was canceled.

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