usb: common: otg-fsm: add license to usb-otg-fsm

[Oscar]

usb: common: otg-fsm: add license to usb-otg-fsm.

Fix warning about tainted kernel because usb-otg-fsm has no license.
WARNING: with this patch usb-otg-fsm module can be loaded
but then the kernel hangs. Tested with a udoo quad board.

Signed-off-by: Oscar Curero <oscar@xxxxxxxxxxxx>
---

--- a/drivers/usb/common/usb-otg-fsm.c.orig     2016-06-12 
12:02:09.269814317 +0200
+++ b/drivers/usb/common/usb-otg-fsm.c  2016-06-12 12:01:54.473000410 
+0200
@@ -21,6 +21,7 @@
  * 675 Mass Ave, Cambridge, MA 02139, USA.
  */

+#include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/types.h>
 #include <linux/mutex.h>
@@ -452,3 +453,4 @@ int otg_statemachine(struct otg_fsm *fsm
        return state_changed;
 }
 EXPORT_SYMBOL_GPL(otg_statemachine);
+MODULE_LICENSE("GPL");