Update barbet SVN to 29 am: 6e7bb46b38

Original change: https://googleplex-android-review.googlesource.com/c/device/google/barbet/+/20102169

Change-Id: I464ed86c964b096bdb2d5e54fdab0d2feee410ee
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>