Preliminary support for lz4diff + EROFS parsing am: cb2dc889c4 am: c05d772f9b am: 539ce2fc1a

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/1900696

Change-Id: I5aade18ad19b936c31a432879dbbd205f9e7960b