Merge "Add binary to write basic COW" into main am: 0fc7feeafb am: e42df43569 am: a37a965ccd am: 6daa94d796

Original change: https://android-review.googlesource.com/c/platform/system/core/+/2763849

Change-Id: Ib280a68603b808f240abc40ce2fe37096f261e27
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>