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/rewrite_graph.py b/ethosu/vela/rewrite_graph.py
index 42acaf9..b29f7a2 100644
--- a/ethosu/vela/rewrite_graph.py
+++ b/ethosu/vela/rewrite_graph.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
 #
@@ -13,6 +13,7 @@
 # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+#
 # Description:
 # Functions for abstracting out the traversal and rewriting of graphs so that the optimisation passes can focus on the
 # correct operation.