nvc0: enable ARB_shader_image_load_store on GK104

This exposes 8 images for all shader types.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Ilia Mirkin <imirkin@alum.mit.edu>

src/gallium/drivers/nouveau/nvc0/nvc0_screen.c

@@ -380,6 +380,8 @@ nvc0_screen_get_shader_param(struct pipe_screen *pscreen, unsigned shader,
    case PIPE_SHADER_CAP_MAX_UNROLL_ITERATIONS_HINT:
       return 32;
    case PIPE_SHADER_CAP_MAX_SHADER_IMAGES:
+      if (class_3d == NVE4_3D_CLASS)
+         return NVC0_MAX_IMAGES;
       return 0;
    default:
       NOUVEAU_ERR("unknown PIPE_SHADER_CAP %d\n", param);