cuda.bindings.nvml: Small follow-on to #1524

[mdboom]

This is a small set of follow-on work that was missed in #1524 (which added a bunch of hand-written wrappers to cuda.bindings.nvml).

1. One hand-written wrapper was missed: device_get_current_clock_freqs
2. The handling of structs with fixed size arrays that are actually dynamically sized got some more testing on the code generator side, revealing a bug in the length checks. Those are fixed here.
3. A few of the hand-written functions had incorrect return signatures. Cython doesn't really care about these, but for correctness these have been fixed.

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[mdboom]

/ok to test

[Copilot]

Pull request overview

This PR contains follow-on work to #1524 that was missed in the original implementation. The changes focus on: (1) adding the missed hand-written wrapper device_get_current_clock_freqs, (2) fixing length checks for structs with dynamically-sized fixed arrays, and (3) correcting return type signatures for several hand-written functions.

Changes:

• Added hand-written wrapper for device_get_current_clock_freqs with proper string return type
• Fixed array length validation in setters for BridgeChipHierarchy, ClkMonStatus, ConfComputeGpuCertificate, ConfComputeGpuAttestationReport, NvlinkSupportedBwModes_v1, and GridLicensableFeatures classes
• Corrected return type signatures for multiple functions and moved version initialization inside nogil blocks for thread safety

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
cuda_bindings/tests/nvml/test_device.py	Updated test to expect string return type instead of struct for device_get_current_clock_freqs
cuda_bindings/cuda/bindings/_nvml.pyx	Removed auto-generated DeviceCurrentClockFreqs_v1 class, added hand-written device_get_current_clock_freqs function, fixed array length checks in struct setters, corrected return type signatures, and moved version initialization inside nogil blocks
cuda_bindings/cuda/bindings/_nvml.pxd	Added typedef for DeviceCurrentClockFreqs_v1 and removed old function declaration

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[mdboom]

/ok to test

[github-actions]

Backport failed for 12.9.x, because it was unable to cherry-pick the commit(s).

Please cherry-pick the changes locally and resolve any conflicts.

git fetch origin 12.9.x
git worktree add -d .worktree/backport-1537-to-12.9.x origin/12.9.x
cd .worktree/backport-1537-to-12.9.x
git switch --create backport-1537-to-12.9.x
git cherry-pick -x f4d32072396a240a962eaf3ae108abd0536e9acf

[github-actions]

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