Staging: otus: includecheck fix: drivers/staging/otus/usbdrv.h

fix the following 'make includecheck' warning:

  drivers/staging/otus/usbdrv.h: linux/usb.h is included more than once.

Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>