radv/gfx10: fix VK_KHR_pipeline_executable_properties with NGG GS
No GS copy shader if a pipeline enables NGG GS.
This fixes dEQP-VK.pipeline.executable_properties.graphics.geometry_stage.
Fixes: 86864eed ("radv: Implement radv_GetPipelineExecutablePropertiesKHR.") Signed-off-by: Samuel Pitoiset samuel.pitoiset@gmail.com