s390: char: add SPDX identifiers to the remaining files

It's good to have SPDX identifiers in all files to make it easier to
audit the kernel tree for correct licenses.

Update the drivers/s390/char/ files with the correct SPDX license
identifier based on the license text in the file itself.  The SPDX
identifier is a legally binding shorthand, which can be used instead of
the full boiler plate text.

This work is based on a script and data from Thomas Gleixner, Philippe
Ombredanne, and Kate Stewart.

Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Kate Stewart <kstewart@linuxfoundation.org>
Cc: Philippe Ombredanne <pombredanne@nexb.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>

drivers/s390/char/fs3270.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * IBM/3270 Driver - fullscreen driver.
  *

drivers/s390/char/hmcdrv_mod.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  *    HMC Drive DVD Module
  *

drivers/s390/char/monreader.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * Character device driver for reading z/VM *MONITOR service records.
  *

drivers/s390/char/monwriter.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * Character device driver for writing z/VM *MONITOR service records.
  *

drivers/s390/char/raw3270.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * IBM/3270 Driver - core functions.
  *

drivers/s390/char/sclp_async.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * Enable Asynchronous Notification via SCLP.
  *

drivers/s390/char/tape_34xx.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  *    tape device discipline for 3480/3490 tapes.
  *

drivers/s390/char/tape_3590.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  *    tape device discipline for 3590 tapes.
  *

drivers/s390/char/tape_class.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright IBM Corp. 2004
  *

drivers/s390/char/tape_core.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  *    basic function of the tape device driver
  *

drivers/s390/char/tty3270.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  *    IBM/3270 Driver - tty functions.
  *

drivers/s390/char/vmlogrdr.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  *	character device driver for reading z/VM system service records
  *

drivers/s390/char/vmur.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * Linux driver for System z and s390 unit record devices
  * (z/VM virtual punch, reader, printer)

drivers/s390/char/zcore.c

+// SPDX-License-Identifier: GPL-1.0+
 /*
  * zcore module to export memory content and register sets for creating system
  * dumps on SCSI disks (zfcpdump). The "zcore/mem" debugfs file shows the same