Revert "temp revert "Add WhisperPush category to security settings""

It removes itself if the feature doesn't exist.
 
This reverts commit 2d8ea47346fcf5a7ac5485dcacc8c4be573a8053.

Change-Id: I1af6a90069a96418c92d2e42e43d6d3a6a8714ef
Merge "Revert "temp revert "Add WhisperPush category to security settings""" into kk44