MLBEDSW-6620: Update copyright notice and years

- Update copyright notices to use SPDX format and add OSS mail as contact.
- Update years on files where it had been missed.

Signed-off-by: Rickard Bolin <rickard.bolin@arm.com>
Change-Id: I7e9715ea4e17b76252728c708e46df12ad67ab1f
diff --git a/ethosu/vela/test/extapi/test_extapi_create_payload.py b/ethosu/vela/test/extapi/test_extapi_create_payload.py
index 06dd220..0860685 100644
--- a/ethosu/vela/test/extapi/test_extapi_create_payload.py
+++ b/ethosu/vela/test/extapi/test_extapi_create_payload.py
@@ -1,4 +1,4 @@
-# Copyright (C) 2020 Arm Limited or its affiliates. All rights reserved.
+# SPDX-FileCopyrightText: Copyright 2020 Arm Limited and/or its affiliates <open-source-office@arm.com>
 #
 # SPDX-License-Identifier: Apache-2.0
 #