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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✅ You can merge normally! (2 Unrelated Failures)

As of commit 5bfe9e5 with merge base 569cf41 ():

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

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[meta-codesync]

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