pipe-loader: add pipe_loader_ops::configuration()

Required for the dri state-tracker. Will be used to retrieve
driver specific configuration parameters:
 - share_fd (dmabuf) capability
 - throttle

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>

src/gallium/auxiliary/pipe-loader/pipe_loader.c

@@ -61,6 +61,13 @@ pipe_loader_release(struct pipe_loader_device **devs, int ndev)
       devs[i]->ops->release(&devs[i]);
 }
 
+const struct drm_conf_ret *
+pipe_loader_configuration(struct pipe_loader_device *dev,
+                          enum drm_conf conf)
+{
+   return dev->ops->configuration(dev, conf);
+}
+
 struct pipe_screen *
 pipe_loader_create_screen(struct pipe_loader_device *dev,
                           const char *library_paths)