MLBEDSW-4064: Update copyright headers

All files which have been updated in 2021 and contain a copyright header have had their headers updated.

Signed-off-by: erik.andersson@arm.com <erik.andersson@arm.com>
Change-Id: Ia682111a719d16e690433398ccfb69c7e93c1cd1
diff --git a/ethosu/vela/architecture_features.py b/ethosu/vela/architecture_features.py
index f7d5fd6..b9c3409 100644
--- a/ethosu/vela/architecture_features.py
+++ b/ethosu/vela/architecture_features.py
@@ -1,4 +1,4 @@
-# Copyright (C) 2020 Arm Limited or its affiliates. All rights reserved.
+# Copyright (C) 2020-2021 Arm Limited or its affiliates. All rights reserved.
 #
 # SPDX-License-Identifier: Apache-2.0
 #