Update license notification in files initially contributed by Sam

This updates these files to use the license notification that uses only
the BSD license. The changes were acknowledged by email (Sam Leffler
<sam@errno.com>, Sat, 30 Jun 2012 07:57:53 -0700).

Signed-hostap: Jouni Malinen <j@w1.fi>

src/drivers/driver_atheros.c

@@ -5,14 +5,8 @@
  * Copyright (c) 2005-2007, Jouni Malinen <j@w1.fi>
  * Copyright (c) 2009, Atheros Communications
  *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * Alternatively, this software may be distributed under the terms of BSD
- * license.
- *
- * See README and COPYING for more details.
+ * This software may be distributed under the terms of the BSD license.
+ * See README for more details.
  */
 
 #include "includes.h"

src/drivers/driver_bsd.c

@@ -3,14 +3,8 @@
  * Copyright (c) 2004, Sam Leffler <sam@errno.com>
  * Copyright (c) 2004, 2Wire, Inc
  *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * Alternatively, this software may be distributed under the terms of BSD
- * license.
- *
- * See README and COPYING for more details.
+ * This software may be distributed under the terms of the BSD license.
+ * See README for more details.
  */
 
 #include "includes.h"

src/drivers/driver_madwifi.c

@@ -4,14 +4,8 @@
  * Copyright (c) 2004, Video54 Technologies
  * Copyright (c) 2004-2007, Jouni Malinen <j@w1.fi>
  *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * Alternatively, this software may be distributed under the terms of BSD
- * license.
- *
- * See README and COPYING for more details.
+ * This software may be distributed under the terms of the BSD license.
+ * See README for more details.
  *
  * While this driver wrapper supports both AP (hostapd) and station
  * (wpa_supplicant) operations, the station side is deprecated and

src/l2_packet/l2_packet_freebsd.c

@@ -3,14 +3,8 @@
  * Copyright (c) 2003-2005, Jouni Malinen <j@w1.fi>
  * Copyright (c) 2005, Sam Leffler <sam@errno.com>
  *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * Alternatively, this software may be distributed under the terms of BSD
- * license.
- *
- * See README and COPYING for more details.
+ * This software may be distributed under the terms of the BSD license.
+ * See README for more details.
  */
 
 #include "includes.h"