Add payload_hash/metadata_hash to update scripts am: 9a2d9a303d am: 823078485b am: b507ef3fc2

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/2850108

Change-Id: Iad86b6d5e7c5989e42044a5799ce1f2fd63e512c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>