clean gather.cu.h comment (PaddlePaddle#76193)

Author: co63oc

paddle/phi/kernels/funcs/gather.cu.h

@@ -16,10 +16,9 @@ limitations under the License. */
 
 #include <vector>
 
-#include "paddle/phi/common/memory_utils.h"
-// TODO(paddle-dev): move gpu_primitives.h to phi
 #include "paddle/phi/backends/gpu/gpu_launch_config.h"
 #include "paddle/phi/backends/gpu/gpu_primitives.h"
+#include "paddle/phi/common/memory_utils.h"
 #include "paddle/phi/common/place.h"
 #include "paddle/phi/core/dense_tensor.h"
 #include "paddle/phi/kernels/funcs/aligned_vector.h"