Add vcu128 board to VivadoAccelerator backend

[HamzaEzzRa]

Add VCU128 board support to hls4ml. Added and tested with Vivado 2019.1

Type of change

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• [ ] Bug fix (non-breaking change that fixes an issue)
• [ ] Documentation update
• [x] 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

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Test Configuration:

Checklist

• [x] 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.
• [x] My changes generate no new warnings.
• [x] 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.

[JanFSchulte]

Is there anything preventing us from merging this?