Change license from ONF-Member-Only to Apache-2.0

Change-Id: I031b31427f78d0c238342124638327fcc933ea29
diff --git a/pfcp-agent/templates/_helpers.tpl b/pfcp-agent/templates/_helpers.tpl
index 2746e4c..e6d7275 100644
--- a/pfcp-agent/templates/_helpers.tpl
+++ b/pfcp-agent/templates/_helpers.tpl
@@ -2,7 +2,7 @@
 
 # Copyright 2020-present Open Networking Foundation
 #
-# SPDX-License-Identifier: LicenseRef-ONF-Member-Only-1.0
+# SPDX-License-Identifier: Apache-2.0
 
 */ -}}