USB: ftdi_sio: Add USB Product Id for OpenDCC

USB product id registration for the OpenDCC (www.opendcc.de)
model railway central unit. Applies to 2.6.21.1.

Signed-off-by: Guido Scholz <guido.scholz@bayernline.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>