overlay: use original samsung logo.

-The kernel has the CM galaxy (s) logo in it which seems odd when
running SlimKat. This file restores the original samsung boot logo.
init: Install busybox in sbin and adb shell before mounts.

-This commit is similar to https://github.com/Meticulus/slim_device_samsung_venturi/commit/a2d1425fdc22b28c143bc150274e1cb5f45cde28
in that it enables adb shell before /system is mounted but
this is for normal boot instead of recovery.

-This also installs busybox in /sbin (all symlinks) for diagnostic purposes
such as getting adb shell for logs when system wont boot.

-This commit also fixes the above mentioned commit by placing busybox in /sbin.
I was looking for the most prudent way to do that, and I think I've got it.
charger: disable vblank.

-Doesn't really do anything now but might assist in charge mode
seg fault.
vendor setup: add eng