fb: volume rocker controll (wake up and volume) thanks to

CM and omni for the proxy sensor idea

Change-Id: I60f5f88e32a129afda80f5b0f4f41cb0a322b691
fb: fix google observer derp

the way it was it does not detect any observer change on the
immsersive value. Fixed it by settings it to Secure completly

Change-Id: If8cf887650668e2399367e09614e91cc30b7f70b