Fix Vivado Accelerator missing partition factor variable

[bo3z]

Description

📝 Fixes the missing maximum_size variable for the partition_factor in Vivado Accelerator backend

• (Possible) Fix for Pre-synthesis failed in both project and in part7a_bitstream tutorial #1157

Type of change

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

Tests

None yet; still needs confirmation that it fixes the issue confirmed in #1157

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.