Add OWNERS for MTP functionality am: b123928699 am: 14c8b4f3d3 am: 68fb7c2283

Original change: https://android-review.googlesource.com/c/platform/packages/services/Mtp/+/2628009

Change-Id: I611d7f821113f23f65903fd01bdd4148bb330920
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>