Add payload_hash/metadata_hash to update scripts am: 9a2d9a303d

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

Change-Id: I45bac72acf17b4369544bcf63ec5ed3246ff9290
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>