Revert "Settings: Remove System updates"

We're going to make use of this :)

This reverts commit 0cb067c101ba66fb0fc1408b906642f6ca4c96c9.

Change-Id: I29da9c36412c200383fb10bf2697042bffe5f5ee
Merge "Revert "Settings: Remove System updates"" into android-4.4
Merge branch 'android-4.4' of https://github.com/omnirom/android_packages_apps_Settings into android-4.4