* Used to "live" in fw/b since ever, but will be here from now on.
* This also brings AOSP configs (config_longPressOnHomeBehavior and
config_doubleTapOnHomeBehavior) to the SDK since those are being
extended, putting everything in one place.
* Long pressing home button will now default to launch assistant
and menu button to open recent apps, leaving the past behind.
Change-Id: I0ca2b2cf9a565a334c3edf19a978fa6d2c4d2ea3