Merge "libsnapshot_cow: Prepare device to boot from pre-created snapshots"...

Merge "libsnapshot_cow: Prepare device to boot from pre-created snapshots" into main am: 6b78aac2 am: eaf919aa am: 87a38fab am: 014d68dd

Original change: https://android-review.googlesource.com/c/platform/system/core/+/2746258



Change-Id: Iacca937dd41ee352135c062362d05a1a097b20fd
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>