Add ability to hide volume rocker preferences

also make the config_show_volumeRockerWake config to false

see more details: http://review.cyanogenmod.org/#/c/26310/

Change-Id: Id885aa423074b3e3fb871716560837a183357cac
Revert "Add ability to hide volume rocker preferences"

This reverts commit 3e87310816cfafed6f649b5c20568f2d6f279130.
Merge remote-tracking branch 'cm/cm-10.1' into cm-10.1-sgt7-dev