fix SPDX identifier typos

TESTS/host_tests/device_echo.py

@@ -1,7 +1,6 @@
 """
-mbed SDK
-Copyright (c) 2011-2016 ARM Limited
-SPDX-License-Identifier: Apache-2.
+Copyright (c) 2011-2020, Arm Limited and affiliates
+SPDX-License-Identifier: Apache-2.0
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.

TESTS/host_tests/rtc_calc_auto.py

@@ -1,7 +1,6 @@
 """
-mbed SDK
-Copyright (c) 2011-2013 ARM Limited
-SPDX-License-Identifier: Apache-2.
+Copyright (c) 2011-2020, Arm Limited and affiliates
+SPDX-License-Identifier: Apache-2.0
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.

TESTS/host_tests/trng_reset.py

@@ -1,12 +1,12 @@
 """
-Copyright (c) 2018 ARM Limited
-SPDX-License-Identifier: Apache-2.
+Copyright (c) 2018-2020, Arm Limited and affiliates
+SPDX-License-Identifier: Apache-2.0
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at
 
-http://www.apache.org/licenses/LICENSE-2.0
+    http://www.apache.org/licenses/LICENSE-2.0
 
 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,

platform/mbed_mpu_mgmt.h

@@ -1,6 +1,6 @@
-/* mbed Microcontroller Library
- * Copyright (c) 2006-2019 ARM Limited
- * SPDX-License-Identifier: Apache-2.
+/*
+ * Copyright (c) 2018-2020, Arm Limited and affiliates.
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -14,6 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 #ifndef MBED_MPU_MGMT_H
 #define MBED_MPU_MGMT_H