Merge "create_snapshot: Enable v3 writer + variable block size" into main am:...

Merge "create_snapshot: Enable v3 writer + variable block size" into main am: c65b6e62 am: 321c7142

Original change: https://android-review.googlesource.com/c/platform/system/core/+/2954450



Change-Id: I1d7a912c530532d3b6e37ec2b4e749820c6dcd8a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>