Don't partition fp16 GeLU on XNNPACK for now

[GregoryComer]

Summary: Older versions of the XNNPACK library don't properly support fp16 GeLU. Disable partitioning until we pull in a newer version of XNNPACK (tracking in #16679).

Fixes #16672.

Differential Revision: D90899836

[pytorch-bot]

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❌ 1 New Failure, 8 Unrelated Failures

As of commit 1ffdc66 with merge base d305410 ():

NEW FAILURE - The following job has failed:

• Build Presets / linux (llm, linux.arm64.2xlarge, executorch-ubuntu-22.04-gcc11-aarch64) / build (gh)

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

• pull / test-static-llama-qnn-linux (stories_110m) / linux-job (gh) (similar failure)
  ##[error]The operation was canceled.
• pull / unittest / windows / windows-job (gh) (similar failure)
  backends/test/harness/tests/test_error_statistics.py::ErrorStatisticsTests::test_error_stats_simple

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

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

• pull / test-static-llama-qnn-linux (stories_260k_bc) / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / unittest / linux / linux-job (gh) (trunk failure)
  backends/test/harness/tests/test_error_statistics.py::ErrorStatisticsTests::test_error_stats_simple
• pull / unittest / macos / macos-job (gh) (trunk failure)
  backends/test/harness/tests/test_error_statistics.py::ErrorStatisticsTests::test_error_stats_simple
• pull / unittest-editable / linux / linux-job (gh) (trunk failure)
  backends/test/harness/tests/test_error_statistics.py::ErrorStatisticsTests::test_error_stats_simple
• pull / unittest-editable / macos / macos-job (gh) (trunk failure)
  backends/test/harness/tests/test_error_statistics.py::ErrorStatisticsTests::test_error_stats_simple
• pull / unittest-editable / windows / windows-job (gh) (trunk failure)
  backends/test/harness/tests/test_error_statistics.py::ErrorStatisticsTests::test_error_stats_simple

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[meta-codesync]

@GregoryComer has exported this pull request. If you are a Meta employee, you can view the originating Diff in D90899836.