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/fp_math.py b/ethosu/vela/fp_math.py
index 2913ff6..25ff4b3 100644
--- a/ethosu/vela/fp_math.py
+++ b/ethosu/vela/fp_math.py
@@ -1,4 +1,4 @@
-# Copyright (C) 2020-2021 Arm Limited or its affiliates. All rights reserved.
+# SPDX-FileCopyrightText: Copyright 2020-2021 Arm Limited and/or its affiliates <open-source-office@arm.com>
 #
 # Copyright 2015 The Gemmlowp Authors. All Rights Reserved.
 #