Cellular: add SPDX identifier

Jari Poyhonen · Jari Poyhonen · commit b0c7c266c6a2 · 2019-02-19T10:42:04.000+02:00
diff --git a/features/netsocket/CellularInterface.h b/features/netsocket/CellularInterface.h
@@ -1,4 +1,5 @@
 /* Copyright (c) 2019 ARM Limited
+ * 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.

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,5 @@`
`1`	`1`	`/* Copyright (c) 2019 ARM Limited`
	`2`	`+ * SPDX-License-Identifier: Apache-2.0`
`2`	`3`	`*`
`3`	`4`	`* Licensed under the Apache License, Version 2.0 (the "License");`
`4`	`5`	`* you may not use this file except in compliance with the License.`