Add vgf to extension LLM

[Sebastian-Larsson]

cc @digantdesai @SS-JIA @freddan80 @per @zingo @oscarandersson8218 @mansnils @robell @larryliu0820 @mergennachin @cccclai @helunwencser @jackzhxng

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/17757

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❌ 4 New Failures, 2 Pending, 2 Unrelated Failures

As of commit cc8dc0c with merge base b778155 ():

NEW FAILURES - The following jobs have failed:

• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t ff5f84a1961f5215222ed811382f0a74dbaa9657a91c3f11040db3801fc90439 /exec failed with exit code 1
• pull / test-samsung-quantmodels-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 248e4616a13c99e843ee80c037023457fe23dca12b5992630ad7bb12a4e3b16e /exec failed with exit code 1
• trunk / test-llama-runner-mac (fp32, coreml) / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1
• trunk / test-models-macos-cpu (llama, portable) / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1

FLAKY - The following jobs failed but were likely due to flakiness present on trunk:

• pull / test-models-linux (emformer_transcribe, xnnpack-quantization-delegation, linux.2xlarge) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• pull / test-models-linux (ic3, portable, linux.2xlarge) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

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[zingo]

Hi @SS-JIA here is PR 3/3 of adding stuff to this non Arm file :)