dzn: expose VK_KHR_driver_properties
We're not quite conformant with the extension, because we don't have a valid conformance version.
That's not a quick-fix, so we should probably just accept some failures for now.
In addition, there's a bunch of things that aren't up to VK 1.2 spec, but since we're not enabling VK 1.2 support yet, this should be fine for now.
Edited by Erik Faye-Lund