Add payload_hash/metadata_hash to update scripts am: 9a2d9a303d am: baec0ad71e

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

Change-Id: I8ee2179789fe82bf55b6f11024f86a4e0a704624
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>