Add proximity wake flag

Use frameworks opt-in functionality.

Depends on http://review.cyanogenmod.org/#/c/69169/

Change-Id: Ib078b65252bd5ca4da3d71d8d73f66ba7e8bf333
g2: set volume last to avoid pops on speaker

this fixes the occasional pops on my d802...

Change-Id: I275c7e4ac02d1f388978c543a281f066c42a9e68
Clean up audio and bring in line with CM

Change-Id: I02b488f9292784d6ee451489cf058ec15ffc7468