drm/nouveau/platform: remove subclassing of nvkm_device

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
diff --git a/drivers/gpu/drm/nouveau/include/nvkm/core/device.h b/drivers/gpu/drm/nouveau/include/nvkm/core/device.h
index ffff6fd..d48e500 100644
--- a/drivers/gpu/drm/nouveau/include/nvkm/core/device.h
+++ b/drivers/gpu/drm/nouveau/include/nvkm/core/device.h
@@ -144,6 +144,8 @@
 	struct nvkm_sw *sw;
 	struct nvkm_engine *vic;
 	struct nvkm_engine *vp;
+
+	struct nouveau_platform_gpu *gpu;
 };
 
 struct nvkm_device *nvkm_device_find(u64 name);