Remove vcu128

[sarpadi]

VCU128 was discontinued by Xilinx, removing support

PR Type

• Bug fix (change that fixes an issue)
• New feature (change that adds new functionality)
• Breaking change (has dependencies in other repos or will cause CI to fail)
• Documentation

PR Checklist

• I have followed the code style guidelines
• I have performed a self-review of changes
• I have compiled all hdl projects and libraries affected by this PR
• I have tested in hardware affected projects, at least on relevant boards
• I have commented my code, at least hard-to-understand parts
• I have signed off all commits from this PR
• I have updated the documentation (wiki pages, ReadMe files, Copyright etc)
• I have not introduced new Warnings/Critical Warnings on compilation
• I have added new hdl testbenches or updated existing ones

[gastmaier]

There are two mentions of it that should be removed or point to 2023_r2
https://github.com/analogdevicesinc/hdl/blob/remove_vcu128/docs/library/jesd204/index.rst?plain=1#L477
https://github.com/analogdevicesinc/hdl/blob/remove_vcu128/docs/projects/template/index.rst?plain=1#L58-L59