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

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

Change-Id: Ie19360b1630f09b5e8c1e2adbd6c4e887c018f2f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>