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

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



Change-Id: I42adb1817f4796713885447fb5a8a92a7e721aef
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>