add Voice Wakeup switch

Change-Id: I1c129adf1104dd95d3afb76224af4c9ba2b5db96
Settings: Fix VoiceWakeup settings crash

The activity wasn't able to launch because
of this missing entry.

Change-Id: I7a3bee2ce047a27fe16975955b2263aeeb33b8a7
Signed-off-by: Roman Birg <roman@cyngn.com>