commit a6f03312 upstream.

Added the USB serial console device ID for Siemens Ruggedcom devices
which have a USB port for their serial console.
Signed-off-by: Len Sorensen <lsorense@csclub.uwaterloo.ca>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>