drm/nouveau/gr: convert to new-style nvkm_engine

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/nouveau_bo.c

@@ -48,7 +48,8 @@ nv10_bo_update_tile_region(struct drm_device *dev, struct nouveau_drm_tile *reg,
 {
 	struct nouveau_drm *drm = nouveau_drm(dev);
 	int i = reg - drm->tile.reg;
-	struct nvkm_fb *fb = nvxx_fb(&drm->device);
+	struct nvkm_device *device = nvxx_device(&drm->device);
+	struct nvkm_fb *fb = device->fb;
 	struct nvkm_fb_tile *tile = &fb->tile.region[i];
 
 	nouveau_fence_unref(&reg->fence);