Aether-3088 change license to Apache-2.0

Change-Id: I42d7535e82065a8031119bee17594d3fb358a1e5
diff --git a/config-models/aether-1.x/files/yang/aether-subscriber.yang b/config-models/aether-1.x/files/yang/aether-subscriber.yang
index d4e3fbd..880dd82 100644
--- a/config-models/aether-1.x/files/yang/aether-subscriber.yang
+++ b/config-models/aether-1.x/files/yang/aether-subscriber.yang
@@ -1,6 +1,6 @@
 // SPDX-FileCopyrightText: 2021 Open Networking Foundation
 //
-// SPDX-License-Identifier: LicenseRef-ONF-Member-Only-1.0
+// SPDX-License-Identifier: Apache-2.0
 
 module aether-subscriber {
   namespace "http://opennetworking.org/aether/subscriber";