Arm backend: Enable devtools flag when using et-dump in vkml runner

[ArmRyan]

Change-Id: I833df8a2e65169e03eb4543ef1f9f3d7ec87563b

cc @freddan80 @per @zingo @oscarandersson8218 @digantdesai

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/15221

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❌ 2 New Failures, 6 Pending

As of commit b455912 with merge base 53c1a77 ():

NEW FAILURES - The following jobs have failed:

• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 3f9f98dbc71a7433375eafab0fc1e9d24dcad94cf9f37cf36f88ae02bc9d1c55 /exec failed with exit code 1
• Test CUDA Builds / export-voxtral-cuda-artifact / linux-job (gh)
  RuntimeError: Command docker exec -t 62e8e16822d657facfeea4e68aba8f8d2f5a8e217ac97e4f3b59b5d12062bda4 /exec failed with exit code 2

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[mansnils]

Failing jobs unrelated