Merge "init: Shutdown services and umount partitions" into main am: 8e185dd373

Original change: https://android-review.googlesource.com/c/platform/system/core/+/3503739

Change-Id: I9c94b0351a5a277a9f06946bb559727e1f376064
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>