DO NOT MERGE - f2fs-tools: ensure that unused xattr space is zeroized am: f7c0ca9f8b am: 51a297aadc am: ea48e068e7

Original change: https://googleplex-android-review.googlesource.com/c/platform/external/f2fs-tools/+/25177146

Change-Id: Ia537c3caf47a46364e22c4a61c4130807e4cfbc1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>