Merge "Add prefetch directory in /metadata" into main am: 0582e461

Original change: https://android-review.googlesource.com/c/platform/system/core/+/3367707



Change-Id: Ibb9555b9406e34460ee3e656bdc944aceb8ce9be
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>