Revert "Settings: Add HeadsUp setting."

Jesus no likey

This reverts commit 59bb8e73d0b02a79b4a46b4ecb576bd4e6f1bca9.

Change-Id: I77421156e042a6375098d8989b7d782b3884d044
Merge branch 'kitkat' of https://github.com/AOSPA-legacy/android_packages_apps_Settings into kk4.4