Autoinstalls loading xml

> Launcher checkes for an apk in the system image with a broadcast
receiver for action:
com.android.launcher3.action.LAUNCHER_CUSTOMIZATION
> Default layout is parsed from that apk, which can also contain
icons and string resources used in the layout config

Change-Id: I44fc9e7c3134f525f7b5db29f4e8bb56e17ce445