Merge "Move the ART prebuilt update script to a location outside the ART sources." am: 6aa3ac0cff am: f7b29d8e08 am: 3381d1b07b

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

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I6b119ad287fde035f81db312d7a00d847a4d6401