Feature : Volume adjust sound preference 2/2

This patch allows the users to choose if they want the audible tone when adjusting the volume

The new preference is in
Settings | Sound
    Volume adjust sound
        Play sound when adjusting volume with hard keys
The Checkbox is defaulted to ON (1 in defaults.xml)

Look for 1/2 for the Framework volume panel change

Change-Id: I6d43cba83bf4cf10f2d50502e7cee5408a73c520
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
Merge remote branch 'cm/cm-10.1'