anv/pipeline: Set stage URB size to zero if it is unused
anv/pipeline: Set stage URB size to zero if it is unused

Signed-off-by: Jordan Justen <a79006884ba9cf5f4f7fcbb92a15b208780d8c97@intel.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler