config: update local version

update local build reference name to OMNI

Signed-off-by: Humberto Borba <humberos@gmail.com>
Change-Id: I60963de1e22e777d46f1f0c21d61cf3e2ecb21dd
Merge branch 'android-4.4' of https://github.com/omnirom/android_kernel_samsung_smdk4412 into android-4.4