If it is a valid device and does not want to be classifed as rogue then you have to add those APs to Airwave.
Which rule it is classification as rouge? We could manually classify this devices as valid from rogues>detail page.
Regarding device type showing unknown ,try move manufacture and vendor on top and check the status.
Do we have any valid AP 215 already added to Airwave and showing device type unknow in Airwave?