Allow ADB to be enabled by default via a config overlay on a per-device basis.

This is useful for developers that are testing and troubleshooting boot issues
and adb ends up being disabled by default once the system kicks in.  This should
only be used for testing and removed once a device is deemed stable and able to
boot.
Backport "Option to show status bar in expanded desktop mode (2/2)" from CM10.1
This commit allows the user to keep the status bar visible during expanded desktop mode.

Originally author: Michael A. Alcorn
Backported from CM10.1 by: Daveee10