Uses ymal SafeLoader instead am: 3e6c8ea1a7

Original change: https://googleplex-android-review.googlesource.com/c/platform/system/extras/+/19491021

Change-Id: Ia4daa103a918496350ffa7313b8b4516ab972b2f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>