[PATCH] USB: ftdi_sio: new PID for ELV UM100

ftdi_sio: Add PID for "ELV USB Module UM100".
PID sent by Armin Laugher.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>