ROMControl: Remove Needless Preference

Was planning on doing this with the
        multiple custom toggles patch
        but I've run out of energy
        on that idea for the time
        being.  Probably a good time
        to do so now.

Change-Id: I6dac8c2a40efba6c60c337307f7fc724757041f3
Merge "ROMControl: Remove Needless Preference" into jb-mr1
Merge remote-tracking branch 'upstream/jb-mr1' into jb-mr1