scripts: Remove lvl_genvk.py struct_size defs
scripts: Remove lvl_genvk.py struct_size defs

Change-Id: I8a26ef87ab3a15fb582258e11841abc87f107e9f

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