USB: add SPDX identifiers to all remaining files in drivers/usb/

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/usb/ and include/linux/usb* 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: Thomas Gleixner <tglx@linutronix.de>
Cc: Kate Stewart <kstewart@linuxfoundation.org>
Cc: Philippe Ombredanne <pombredanne@nexb.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Acked-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/atm/cxacru.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0+
 /******************************************************************************
  *  cxacru.c  -  driver for USB ADSL modems based on
  *               Conexant AccessRunner chipset

drivers/usb/atm/speedtch.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0+
 /******************************************************************************
  *  speedtch.c  -  Alcatel SpeedTouch USB xDSL modem driver
  *

drivers/usb/atm/ueagle-atm.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
 /*-
  * Copyright (c) 2003, 2004
  *	Damien Bergamini <damien.bergamini@free.fr>. All rights reserved.

drivers/usb/atm/usbatm.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0+
 /******************************************************************************
  *  usbatm.c - Generic USB xDSL driver core
  *

drivers/usb/atm/usbatm.h

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0+
 /******************************************************************************
  *  usbatm.h - Generic USB xDSL driver core
  *

drivers/usb/atm/xusbatm.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0+
 /******************************************************************************
  *  xusbatm.c -	dumb usbatm-based driver for modems initialized in userspace
  *

drivers/usb/c67x00/c67x00-drv.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * c67x00-drv.c: Cypress C67X00 USB Common infrastructure
  *

drivers/usb/c67x00/c67x00-hcd.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * c67x00-hcd.c: Cypress C67X00 USB Host Controller Driver
  *

drivers/usb/c67x00/c67x00-hcd.h

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * c67x00-hcd.h: Cypress C67X00 USB HCD
  *

drivers/usb/c67x00/c67x00-ll-hpi.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * c67x00-ll-hpi.c: Cypress C67X00 USB Low level interface using HPI
  *

drivers/usb/c67x00/c67x00-sched.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * c67x00-sched.c: Cypress C67X00 USB Host Controller Driver - TD scheduling
  *

drivers/usb/c67x00/c67x00.h

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * c67x00.h: Cypress C67X00 USB register and field definitions
  *

drivers/usb/chipidea/bits.h

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * bits.h - register bits of the ChipIdea USB IP core
  *

drivers/usb/chipidea/ci.h

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * ci.h - common structures, functions, and macros of the ChipIdea driver
  *

drivers/usb/chipidea/ci_hdrc_imx.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * Copyright 2012 Freescale Semiconductor, Inc.
  * Copyright (C) 2012 Marek Vasut <marex@denx.de>

drivers/usb/chipidea/ci_hdrc_imx.h

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * Copyright 2012 Freescale Semiconductor, Inc.
  *

drivers/usb/chipidea/ci_hdrc_msm.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /* Copyright (c) 2010, Code Aurora Forum. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify

drivers/usb/chipidea/ci_hdrc_pci.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * ci_hdrc_pci.c - MIPS USB IP core family device controller
  *

drivers/usb/chipidea/ci_hdrc_usb2.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2014 Marvell Technology Group Ltd.
  *

drivers/usb/chipidea/ci_hdrc_zevio.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  *	Copyright (C) 2013 Daniel Tang <tangrs@tangrs.id.au>
  *