Revert the code change block qnn lowering

[billmguo]

Summary: ScalelessRMSNorm block the model lowering, revert to the torch.nn.RMSNorm, the ScalelessRMSNorm block qnn lowering

Differential Revision: D103916912

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/19307

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❌ 2 New Failures, 4 Unrelated Failures

As of commit 9160300 with merge base ca7d5cf ():

NEW FAILURES - The following jobs have failed:

• pull / test-lora-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 17f0cd2a63f565a4c55cb0593eb0d7ad2b89fe3a7134ad73e3e5f84d7f986a07 /exec failed with exit code 1
• pull / test-voxtral-realtime-xnnpack-linux / linux-job (gh)
  RuntimeError: Command docker exec -t c04908680674c024ca6a26b05327b694e39a5fa3e71eaf1cf1958a72978a36e3 /exec failed with exit code 1

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

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

• pull / unittest / linux / linux-job (gh) (trunk failure)
  examples/models/llama/tests/test_static_attention.py::StaticAttentionTest::test_within_transformer
• pull / unittest / macos / macos-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / unittest-editable / linux / linux-job (gh) (trunk failure)
  examples/models/llama/tests/test_static_attention.py::StaticAttentionTest::test_within_transformer
• pull / unittest-editable / macos / macos-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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[meta-codesync]

@billmguo has exported this pull request. If you are a Meta employee, you can view the originating Diff in D103916912.

[github-actions]

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