Fix license headers

Change-Id: I464bb34e2a46e5524f4008d1595d9f9c0c4334d4
diff --git a/Makefile b/Makefile
index 1a24080..edc5af7 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,5 @@
 #
+# SPDX-FileCopyrightText: 2022-present Intel Corporation
 # SPDX-FileCopyrightText: 2020-present Open Networking Foundation <info@opennetworking.org>
 # SPDX-License-Identifier: LicenseRef-ONF-Member-1.01
 #