[mobile/wifi] Port to SimpleKCM
Summary: The plasma-settings app assumes all KCMs to be based on the types from KDeclarative
Test Plan: Runs in plasma-settings
Reviewers: Plasma, mart, jgrulich
Reviewed By: Plasma, mart, jgrulich
Subscribers: plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D22341