staging: android: Clean up license identifiers

Add the identifiers when missing and fix the ones already present
according to checkpatch.pl.
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/android/ashmem.h

-// SPDX-License-Identifier: (GPL-2.0 OR Apache-2.0)
+/* SPDX-License-Identifier: GPL-2.0 OR Apache-2.0 */
 /*
  * include/linux/ashmem.h
  *
  * Copyright 2008 Google Inc.
  * Author: Robert Love
- *
- * This file is dual licensed.  It may be redistributed and/or modified
- * under the terms of the Apache 2.0 License OR version 2 of the GNU
- * General Public License.
  */
 
 #ifndef _LINUX_ASHMEM_H

drivers/staging/android/uapi/ashmem.h

-// SPDX-License-Identifier: (GPL-2.0 OR Apache-2.0)
+/* SPDX-License-Identifier: GPL-2.0 OR Apache-2.0 */
 /*
  * drivers/staging/android/uapi/ashmem.h
  *
  * Copyright 2008 Google Inc.
  * Author: Robert Love
- *
- * This file is dual licensed.  It may be redistributed and/or modified
- * under the terms of the Apache 2.0 License OR version 2 of the GNU
- * General Public License.
  */
 
 #ifndef _UAPI_LINUX_ASHMEM_H

drivers/staging/android/uapi/vsoc_shm.h

+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Copyright (C) 2017 Google, Inc.
  *
- * This software is licensed under the terms of the GNU General Public
- * License version 2, as published by the Free Software Foundation, and
- * may be copied, distributed, and modified under those terms.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
  */
 
 #ifndef _UAPI_LINUX_VSOC_SHM_H

drivers/staging/android/vsoc.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * drivers/android/staging/vsoc.c
  *
@@ -7,16 +8,6 @@
  *
  * Author: ghartman@google.com
  *
- * This software is licensed under the terms of the GNU General Public
- * License version 2, as published by the Free Software Foundation, and
- * may be copied, distributed, and modified under those terms.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- *
  * Based on drivers/char/kvm_ivshmem.c - driver for KVM Inter-VM shared memory
  *         Copyright 2009 Cam Macdonell <cam@cs.ualberta.ca>
  *