[Release Only] Bugfix/fix nxp separable conv test

[MartinPavella]

Summary

Fix failing separable convolution test.

The error is larger on the CI than on my PC.

Fixes #14709

Test plan

N/A

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/14719

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[robert-kalmar]

@GregoryComer , @digantdesai , the fix is in place. How we shall proceed? The branch is protected (make sense). Will you arrange the merging? Or we shall go through the main branch (even thought the test is not failing there)

[mergennachin]

Thanks @robert-kalmar @MartinPavella just merged into our release branch

Cc @GregoryComer

[GregoryComer]

@pytorchbot cherry-pick --onto main -c fixnewfeature

[pytorchbot]

Cherry picking #14719

The cherry pick PR is at #14800 and it is recommended to link a fixnewfeature cherry pick PR with an issue.

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