DeVault: GitHub Copilot and open source laundering

> Not many people may remember this now, but the R200/(reverse-engineered)R300 driver also used to be blob-free. Strangely that stopped being the case after AMD took over, even though it was feature-complete.

Because it made no sense to reimplement the critical power management and link training code multiple times, instead of doing it once in AtomBIOS.