usb: gadget: libcomposite: move MODULE_VERSION to composite.c

MODULE_VERSION and AUTHOR looks better in composite.c than in
usbstrings.c so I move it there.
I put David Brownell as the module Author as I belive he wrote most of
it.
Acked-by: Michal Nazarewicz <mina86@mina86.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/gadget/composite.c

@@ -1684,3 +1684,6 @@ void usb_composite_overwrite_options(struct usb_composite_dev *cdev,
 	}
 }
 EXPORT_SYMBOL_GPL(usb_composite_overwrite_options);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("David Brownell");

drivers/usb/gadget/usbstring.c

@@ -70,4 +70,3 @@ usb_gadget_get_string (struct usb_gadget_strings *table, int id, u8 *buf)
 	return buf [0];
 }
 EXPORT_SYMBOL_GPL(usb_gadget_get_string);
-MODULE_LICENSE("GPL");