Update license headers

Update all license headers to the correct years

Change-Id: I638a854b39b4afe8db6a4a76ca6dcb89c126e3c1
diff --git a/rtos/CMakeLists.txt b/rtos/CMakeLists.txt
index 149779e..941ba32 100644
--- a/rtos/CMakeLists.txt
+++ b/rtos/CMakeLists.txt
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2019-2020 Arm Limited. All rights reserved.
+# Copyright (c) 2019-2021 Arm Limited. All rights reserved.
 #
 # SPDX-License-Identifier: Apache-2.0
 #
diff --git a/rtos/freertos_config/FreeRTOSConfig.h.in b/rtos/freertos_config/FreeRTOSConfig.h.in
index 4e08c3a..005519f 100644
--- a/rtos/freertos_config/FreeRTOSConfig.h.in
+++ b/rtos/freertos_config/FreeRTOSConfig.h.in
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2020 Arm Limited. All rights reserved.
+ * Copyright (c) 2020-2021 Arm Limited. All rights reserved.
  *
  * SPDX-License-Identifier: Apache-2.0
  *