There is a C api in libssusysinfo (version 1.1.0 onwards) for querying
available hw features and hw keys, but it is not suitable for use from
QML applications.

Provide wrapper class that converts data made available by ssusysinfo
in more Qt friendly form and expose DeviceInfo objects for making
queries from QML applications.
Signed-off-by: Simo Piiroinen <simo.piiroinen@jollamobile.com>