drm/ttm/agp: drop back end bindings from agp

These aren't used anymore.
Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200907204630.1406528-11-airlied@gmail.com

drivers/gpu/drm/ttm/ttm_agp_backend.c

@@ -112,12 +112,6 @@ void ttm_agp_destroy(struct ttm_bo_device *bdev,
 }
 EXPORT_SYMBOL(ttm_agp_destroy);
 
-static struct ttm_backend_func ttm_agp_func = {
-	.bind = ttm_agp_bind,
-	.unbind = ttm_agp_unbind,
-	.destroy = ttm_agp_destroy,
-};
-
 struct ttm_tt *ttm_agp_tt_create(struct ttm_buffer_object *bo,
 				 struct agp_bridge_data *bridge,
 				 uint32_t page_flags)
@@ -130,7 +124,6 @@ struct ttm_tt *ttm_agp_tt_create(struct ttm_buffer_object *bo,
 
 	agp_be->mem = NULL;
 	agp_be->bridge = bridge;
-	agp_be->ttm.func = &ttm_agp_func;
 
 	if (ttm_tt_init(&agp_be->ttm, bo, page_flags)) {
 		kfree(agp_be);