Update pulp-nn-mixed submodule

[marchioa]

This PR updates the pulp-nn-mixed submodule to include the fix for an illegal hardware loop configuration related to the pulp_zero_mem utility function PR10. The updated submodule removes the MemoryFence() from the loop, allowing the compiler to correctly generate a valid HW loop and preventing illegal configurations.

Added

• nothing

Changed

• pulp-nn-mixed submodule

Fixed

• nothing

PR Merge Checklist

1. The PR is rebased on the latest devel commit and pointing to devel.
2. Your PR reviewed and approved.
3. All checks are passing.
4. The CHANGELOG.md file has been updated.
5. If the docker was modified, change back its link after review.

[coderabbitai]

📝 Walkthrough

Walkthrough

Updated the submodule pointer for TargetLibraries/PULPOpen/third_party/pulp-nn-mixed to a newer commit. No code, API, runtime, or control flow changes.

Changes

Cohort / File(s)	Summary
Submodule Update TargetLibraries/PULPOpen/third_party/pulp-nn-mixed	Updated commit reference from b69ec23ec81595ebbec694f4a28d84022858af83 to a9b4aaf597c030ce24bf65a00b5f3ec84a1528c4

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main change in the pull request: updating the pulp-nn-mixed submodule pointer to a new commit.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description check	✅ Passed	The pull request description clearly explains the purpose of updating the pulp-nn-mixed submodule to fix an illegal hardware loop configuration issue with the pulp_zero_mem utility function.

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[Xeratec]

LGTM, but please update the changelog. We do this for every PR we merge.