mte: add nnk@google.com to OWNERS am: b7d645e1b4 am: 82dd63c79c

Original change: https://android-review.googlesource.com/c/device/google/gs-common/+/3320735

Change-Id: Iec8e8d3bd0db452755f4c83405da185a55bd2479
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>