Arm backend: Change input distribution on resnet18 test

[gggekov]

cc @freddan80 @per @zingo @oscarandersson8218 @digantdesai

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/14815

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❌ 1 New Failure, 1 Unrelated Failure

As of commit 2dc8bdd with merge base 3b16bc1 ():

NEW FAILURE - The following job has failed:

• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 41bad53c0825edf00e25bfbbeec2a99acd9615425e5d7a11e0d370212b79c683 /exec failed with exit code 1

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

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

• Apple / build-demo-ios / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 74

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