[automerger skipped] Remove the empty property of attestation. am: daa9b128 -s ours

am skip reason: Merged-In Icaf1bcd089767b2c47d0b57064aa72a4c9483bb5 with SHA-1 99fafaec is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/build/+/24707510



Change-Id: I99176b17bdddcf9b3133d5ecccf95e1cecadd4eb
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>