USB: ftdi_sio: added Alti-2 VID and Neptune 3 PID

This patch adds the vendor and product ID for the Alti-2 Neptune 3
(http://www.alti-2.com

) which uses the FTDI chip.

Signed-off-by: Robie Basak <rb-oss-1@justgohome.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>