Add copyright notice to ssl_debug_helpers*

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
diff --git a/library/ssl_debug_helpers.h b/library/ssl_debug_helpers.h
index 7288be1..2fc4163 100644
--- a/library/ssl_debug_helpers.h
+++ b/library/ssl_debug_helpers.h
@@ -1,3 +1,25 @@
+/**
+ * \file ssl_debug_helpers.h
+ *
+ * \brief Automatically generated helper functions for debugging
+ */
+/*
+ *  Copyright The Mbed TLS Contributors
+ *  SPDX-License-Identifier: Apache-2.0
+ *
+ *  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.
+ */
+
 #ifndef MBEDTLS_SSL_DEBUG_HELPERS_H
 #define MBEDTLS_SSL_DEBUG_HELPERS_H