Merge "create_snapshot: Enable v3 writer + variable block size" into main am: c65b6e62cb

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

Change-Id: Icc1fd3401acdc39cf40eef759b651e56b275206b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>