Auto detect minor version for complete partial updates am: 2a18e85a31 am: 618a20ff2b am: a536adead2 am: 7d68da99e1

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/2770381

Change-Id: If65a0cd355b3eabeff6ef2de8594ca73f564b7e8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>