Add OWNERS for MTP functionality am: b123928699 am: 14c8b4f3d3 am: 68fb7c2283 am: 218cb26cad

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

Change-Id: I54748ed69ea200799a05d8a50e359aa6cd6c8dfb
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>