remove libsysinfo, as there is not even config test

Change-Id: I10343700a4e3a73a63435a7daf3d228344afe15f
Reviewed-by: Alex <alexander.blasche@digia.com>
Remove DisplayInfo

Change-Id: I29c4f64bf4a23dbc02daf5540cdbd5cd3d2ac7cb
Reviewed-by: Lorn Potter <lorn.potter@jollamobile.com>
Reviewed-by: Alex <alexander.blasche@digia.com>