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.

Change-Id: Ib17d4e10ec68640ce55a91d5b1067d3d37eeec9d
Fixed derp...

Change-Id: I67cb9d83c1a12bee35e18e25fd143a8a2e77d172
Signed-off-by: Chris Conley <chrisc93@vt.edu>
DERP!