PAL File for Arm BareMetal Executor Runner

[BujSet]

Summary

Platform file for building Arm bare metal executorch applications.

Test plan

Tested against the arm_executor_runner.cpp that is used in the Arm-EthosU tutorial. Was able to successfully build the Arm Executor Runner, and run the simple add model (TODO).

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/12399

• 📄 Preview Python docs built from this PR

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❌ 2 New Failures, 1 Pending

As of commit e9015c7 with merge base 63431bd ():

NEW FAILURES - The following jobs have failed:

• Lint / lintrunner / linux-job (gh)
  >>> Lint for examples/arm/executor_runner/arm_executor_runner.cpp:
• pull / test-eval_llama-mmlu-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 25cd025f0126c9c1875c359f8feacb353ced36024dab1f88e9e98920fd2aac71 /exec failed with exit code 1

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[BujSet]

@digantdesai @zingo Could I get some advice on this PR? I tried making the changes to examples/arm/executor_runner/arm_executor_runner.cpp to use the new file runtime/platform/default/arm_baremetal.hpp, but when I run the setup.sh and run.sh scripts, I'm met with this error:

/home/zephyruser/executorch/examples/arm/executor_runner/arm_executor_runner.cpp:17:10: fatal error: executorch/runtime/platform/defualt/arm_baremetal.hpp: No such file or directory
   17 | #include <executorch/runtime/platform/defualt/arm_baremetal.hpp>
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.

Despite the new header file being moved to the runtime dir in the ET repo, it seems like the setup.sh and run.sh scripts are unable to see this when they try to build executorch. Any ideas why?

[BujSet]

@pytorchbot label "release notes: none"