[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

Forward ported from crDroid kk

Conflicts:
	res/values/cr_arrays.xml
	res/values/cr_strings.xml

Change-Id: I09fc10bda8445234168a6a4a5c1d70a0f1d22d8e