plasma-nm currently has the mobile network KCMs, but requires having a build flag in order to have them installed. This then requires distros to have multiple versions of the plasma-nm package. I think it makes sense to move them here so that packaging and development is easier.
Having the KCMs that are mobile specific here makes more sense than in the settings application. Historically plasma-settings had a faster release cycle than Plasma, but the application is now moving to the Plasma release schedule and so it makes sense do this now.
