Tosa to LLM extension - buck fixes

[SS-JIA]

Summary: As title!

This PR is a copy of #15556 with buck fixes to address internal test failures.

[pytorch-bot]

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❌ 5 New Failures

As of commit 1efa0fa with merge base eee5d96 ():

NEW FAILURES - The following jobs have failed:

• pull / unittest / linux / linux-job (gh)
  RuntimeError: Command docker exec -t 304db5bb78747f6717525b438f6b1f6fa400fc9a71ff6bc653e206ad8601f7cf /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-arm-backend-with-no-deps (test_pytest_models_tosa) / linux-job (gh)
  RuntimeError: Command docker exec -t e1790f2826bdbc64c047ab7dddca98190ecb70fe0fc110750ec7bbb9417af6aa /exec failed with exit code 1
• pull / unittest-editable / linux / linux-job (gh)
  RuntimeError: Command docker exec -t cecb0bc6719978d190c1154e6a1d326ba117aa2478494a920dce20889aadb7e2 /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

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[meta-codesync]

@SS-JIA has exported this pull request. If you are a Meta employee, you can view the originating Diff in D92209173.

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[SS-JIA]

cc: @Sebastian-Larsson @zingo these changes are needed to fix internal tests

[SS-JIA]

@Sebastian-Larsson @zingo this as well