add Voice Wakeup switch
* Requires CYNGN package to do the actual work.

Change-Id: I1c129adf1104dd95d3afb76224af4c9ba2b5db96
Settings: Hide voice wakeup category when package isn't present
Change-Id: I33a34a56b3a1d1ad04b07bde4aec6c3c230fc297