layers: Update vulkan.py with new extensions
layers: Update vulkan.py with new extensions

Change-Id: I1b0623587d7d02849ece97de00ddb1c6bad58819

KhronosGroup/Vulkan-LoaderAndValidationLayers,KhronosGroup/Vulkan-LoaderAndValidationLayers,KhronosGroup/Vulkan-LoaderAndValidationLayers,KhronosGroup/Vulkan-LoaderAndValidationLayers