Arm backend: Add argument to list used fallback ops for run.sh

[zingo]

This make it possible to specify what non EthosU ops to include in the build from the command line when running run.sh. As run.sh supports running models specified in files the hard coded approach is incontinent.

[pytorch-bot[bot]]

:link: Helpful Links

:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/5815

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:x: 1 New Failure, 1 Unrelated Failure

As of commit e7b3c236a078fcf3ad88ef32683db3558c5d412b with merge base 393553ceecb26f73a189e7109c14503b34657c8e ():

NEW FAILURE - The following job has failed:

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

BROKEN TRUNK - The following job 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

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@digantdesai merged this pull request in pytorch/executorch@00d804c18ddeeaf654bf6cff2b7617a7e6a6e3a3.