USB: serial: Remove redundant license text

Now that the SPDX tag is in all USB files, that identifies the license
in a specific and legally-defined manner.  So the extra GPL text wording
can be removed as it is no longer needed at all.

This is done on a quest to remove the 700+ different ways that files in
the kernel describe the GPL license text.  And there's unneeded stuff
like the address (sometimes incorrect) for the FSF which is never
needed.

No copyright headers or other non-license-description text was removed.

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/serial/ipw.c

@@ -5,11 +5,6 @@
  *   Copyright (C) 2004 Roelf Diedericks <roelfd@inet.co.za>
  *   Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
  *
- *   This program is free software; you can redistribute it and/or modify
- *   it under the terms of the GNU General Public License as published by
- *   the Free Software Foundation; either version 2 of the License, or
- *   (at your option) any later version.
- *
  * All information about the device was acquired using SnoopyPro
  * on MSFT's O/S, and examing the MSFT drivers' debug output
  * (insanely left _on_ in the enduser version)