These layers are found in the LunarG "VulkanTools" repository ( https://github.com/LunarG/VulkanTools). I've already filed ITP #890474 for these layers.
- Bug#890009: vulkan: Missing packages for SDK layers. Mike Mestnik
- Bug#890009: vulkan: Missing packages for SDK layers. Timo Aaltonen
- Bug#890009: vulkan lunarg layers Brett Johnson
