Merge "Move the ART prebuilt update script to a location outside the ART sources." am: 6aa3ac0cff am: f7b29d8e08

Original change: https://android-review.googlesource.com/c/platform/packages/modules/ArtPrebuilt/+/1580584

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I1c26ba835c38ad930ecc704cc238aaf545d70a3a