staging: rtl8192u: remove GPL boiler plate text

The SPDX identifier is a legally binding shorthand, which
can be used instead of the full boiler plate text.

The file ieee80211_module.c has a proper SPDX line, so the
GPL boiler plate text is not needed.
Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20200703122604.12096-1-straube.linux@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8192u/ieee80211/ieee80211_module.c

@@ -9,22 +9,6 @@
  *  <jkmaline@cc.hut.fi>
  *  Copyright (c) 2002-2003, Jouni Malinen <jkmaline@cc.hut.fi>
  *
- *  This program is free software; you can redistribute it and/or modify it
- *  under the terms of version 2 of the GNU General Public License as
- *  published by the Free Software Foundation.
- *
- *  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.
- *
- *  You should have received a copy of the GNU General Public License along with
- *  this program; if not, write to the Free Software Foundation, Inc., 59
- *  Temple Place - Suite 330, Boston, MA  02111-1307, USA.
- *
- *  The full GNU General Public License is included in this distribution in the
- *  file called LICENSE.
- *
  *  Contact Information:
  *  James P. Ketrenos <ipw2100-admin@linux.intel.com>
  *  Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497