Treat PReLU in infer_precision

[JanFSchulte]

Fixes #1328 by making sure the precision of the PReLU parameters is correctly inferred. Not inferring them prevented them to be written into the firmware files.

Type of change

For a new feature or function, please create an issue first to discuss it
with us before submitting a pull request.

Note: Please delete options that are not relevant.

• Bug fix (non-breaking change that fixes an issue)

Tests

Script provided in the issue passes after applying this fix.

Test Configuration:

Checklist

• I have read the guidelines for contributing.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• My changes generate no new warnings.
• I have installed and run pre-commit on the files I edited or added.
• I have added tests that prove my fix is effective or that my feature works.

[vloncar]

You don't want to enable that disabled test in pytests?

[JanFSchulte]

Was still trying to get that one to work again. There is still an issue with 3-dim inputs where our results don't look ok, but that's out of scope for thins PR I think.