[settings] long press back to kill configurable timeout (2/2)

1 - 2 seconds (default)
2 - 1,5 seconds
3 - 1 second
4 0,5 second

Change-Id: Ie411efcc752d5827408ec15a08435e66178e355f
Live Volume Steps [2/2]
Change-Id: I8ba0a1ac7b6f55a174e685182afb06781448a6c2