Add API for OSInfo device type

[GF-2433] Add Nyx device type to return OS info

Open-webOS-DCO-1.0-Signed-off-by: Juhani Mesiainen <juhani.mesiainen@palm.com>
Open-webOS-DCO-1.0-Signed-off-by: Pekka Ropo <pekka.ropo@palm.com>
Open-webOS-DCO-1.0-Signed-off-by: Keith Derrick <keith.derrick@lge.com>

Change-Id: I81f819b906c6d60da66fc59b6d8976a9217656a4