smdk4412-common: Device Settings

This mDNIe negative mode as they are currently not supported.
Kernel modifications are required.

SamsungServiceMode needs to be added in roomservice.xml -
https://github.com/omnirom/android_packages_apps_SamsungServiceMode

Change-Id: I09ada8ca042a1b44fef8f2bb3a297c718d6bbc4f