Add license header to lit.site.cfg.py.in

PiperOrigin-RevId: 325515949

tests/lit.site.cfg.py.in

@@ -1,3 +1,16 @@
+# Copyright 2020 The TensorFlow Authors. All Rights Reserved.
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 @LIT_SITE_CFG_IN_HEADER@
 
 import sys