[executorch][arm] Add Tosa to LLM extension

[SS-JIA]

Stack from ghstack (oldest at bottom):

• -> [executorch][arm] Add Tosa to LLM extension #17205

This diff is to facilitate the landing of #15556

Differential Revision: D92280949

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/17205

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❌ 6 New Failures, 2 Unrelated Failures

As of commit 309784c with merge base 477867a ():

NEW FAILURES - The following jobs have failed:

• pull / unittest / linux / linux-job (gh)
  RuntimeError: Command docker exec -t 55c369fa7ef1c3e9b16a2b27cf340643659522c76bbfadcf8c3693df165d119c /exec failed with exit code 1
• pull / unittest / macos / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1
• pull / unittest-editable / linux / linux-job (gh)
  RuntimeError: Command docker exec -t aa8ff39da86a00180a40c7a96d794436471ebadf753317383e8a3dc6a1e248df /exec failed with exit code 1
• pull / unittest-editable / macos / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1
• Test CUDA Builds / check-all-cuda-builds (gh)
  Process completed with exit code 1.
• Test CUDA Builds / test-executorch-cuda-build-13.0 / linux-job (gh)
  RuntimeError: Command docker exec -t cdb933f115b2f5e7305ce5d9b0ed1bff6ed0aa6a6f2dc2f4cf09cd6ff1db843a /exec failed with exit code 1

BROKEN TRUNK - The following jobs failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / test-samsung-models-linux / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-samsung-quantmodels-linux / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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