radv takes over from AMDVLK

AMD have announced the end of the AMDVLK open driver in favour of focusing on radv for Linux use cases. When Bas and I started radv in 2016, AMD were promising their own Linux vulkan driver, which arrived in Dec 2017. At this point radv was already shipping in most Linux distros. AMD strategy of having AMDVLK was developed via over the wall open source releases from internal closed development was…