treewide: Add SpinalHDL USB 1.1 controller

[thommythomaso]

ToDo:

• [x] Add missing commits
• [x] Rebase after FPGA merge
• [x] Clean up existing codebase
• [x] Move control to regbus, verify
• [x] Verify everything still works
• [x] Split off VGA burst split
• [x] Create nice testing solution
• [x] Re-Enable UNBENT
• [x] Adapt OHCI file header to point to source and its license!
• [x] Fix most CI
• [x] Verify, merge, release reg_to_axi
• [ ] FPGA: Constrain IO timing!
• [ ] Extend documentation
• [ ] Differentiate device tree, handle CI

Future stuff:

• Move USB to another repo (reproducible build) OR rewrite
• Tune FIFO, verify
• Re-enable LLC, evaluate uncached DRAM alias window
• Discuss UNBENT parameterization