Add dedicated HiFi kernel for max pool 2d (#18240)

[mcremon-meta]

Summary:

As titled. Calls into nnlib directly.

Reviewed By: hsharma35

Differential Revision: D96874522

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/18240

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❌ 2 New Failures, 10 Cancelled Jobs, 2 Pending, 1 Unrelated Failure

As of commit 9dca6e0 with merge base b7ca1a4 ():

NEW FAILURES - The following jobs have failed:

• pull / test-multimodal-linux (gemma3-4b) / linux-job (gh)
  RuntimeError: Command docker exec -t 17f658e124bb8fe2d31bbd9cd1270dbf5e509cc977cbcf305c5e49d1767ce548 /exec failed with exit code 139
• pull / unittest-editable / macos / macos-job (gh)
  backends/xnnpack/test/ops/test_conv2d.py::TestConv2d::test_fp16_conv2d

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

• pull / unittest / windows / windows-job (gh)
• Test Metal Backend / test-model-metal-e2e (mistralai, Voxtral-Mini-3B-2507, non-quantized) / macos-job (gh)
• Test Metal Backend / test-model-metal-e2e (mistralai, Voxtral-Mini-3B-2507, quantized-int4-metal) / macos-job (gh)
• Test Metal Backend / test-model-metal-e2e (mistralai, Voxtral-Mini-4B-Realtime-2602, quantized-int4-metal) / macos-job (gh)
• Test Metal Backend / test-model-metal-e2e (nvidia, parakeet-tdt, non-quantized) / macos-job (gh)
• Test Metal Backend / test-model-metal-e2e (nvidia, parakeet-tdt, quantized-int4-metal) / macos-job (gh)
• Test Metal Backend / test-model-metal-e2e (openai, whisper-large-v3-turbo, non-quantized) / macos-job (gh)
• Test Metal Backend / test-model-metal-e2e (openai, whisper-large-v3-turbo, quantized-int4-metal) / macos-job (gh)
• Test Metal Backend / test-model-metal-e2e (openai, whisper-small, non-quantized) / macos-job (gh)
• Test Metal Backend / test-model-metal-e2e (openai, whisper-small, quantized-int4-metal) / macos-job (gh)

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 / windows / windows-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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[meta-codesync]

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