separable conv fixes

Created by: rkovachfuentes

A# Description

minimal changes to allow QSeparableConv2D with hls4ml

Type of change

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Note: Please delete options that are not relevant.

• Bug fix (non-breaking change that fixes an issue)
• Documentation update
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• A new research paper code implementation
• Other (Specify)

Tests

tried to compile a model with QSeparableConv2D layers - it did not work before, it works now

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.