update pt2e example code

[cccclai]

Summary: As title, moving to torchao

Reviewed By: jerryzh168

Differential Revision: D82341472

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/14284

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❌ 1 New Failure, 2 Cancelled Jobs, 1 Unrelated Failure

As of commit 22d1a6f with merge base 233063c ():

NEW FAILURE - The following job has failed:

• pull / unittest / macos / macos-job (gh)
  backends/xnnpack/test/ops/test_sub.py::TestSub::test_fp16_sub

CANCELLED JOBS - The following jobs were cancelled. Please retry:

• periodic (gh)
• pull / test-openvino-linux / linux-job (gh)
  ##[error]The operation was canceled.

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

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

• pull / unittest-editable / macos / macos-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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