Add more SPDX-License-Identifier tags

In a number of places we had wordings of the GPL (or LGPL in a few
cases) license text that were split in such a way that it wasn't caught
previously.  Convert all of these to the correct SPDX-License-Identifier
tag.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/drivers/usb/gadget/rndis.h b/drivers/usb/gadget/rndis.h
index d9e3a75..7a389a5 100644
--- a/drivers/usb/gadget/rndis.h
+++ b/drivers/usb/gadget/rndis.h
@@ -4,12 +4,10 @@
  * Authors:	Benedikt Spranger, Pengutronix
  *		Robert Schwebel, Pengutronix
  *
- *		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.
- *
  *		This software was originally developed in conformance with
  *		Microsoft's Remote NDIS Specification License Agreement.
+ *
+ * SPDX-License-Identifier:	GPL-2.0
  */
 
 #ifndef _USBGADGET_RNDIS_H