- functionality for hiding portions of the preferences in the preference screen is added to the support lib. So, changing the settings implementation to use the feature from the support lib instead. - remove ProgressiveDisclosureMixin and the related code Fixes: 63985174 Test: make RunSettingsRoboTests Change-Id: Ib1d39b2db93d78a56c7adf90abcae5226f9564c2