Merge "libprefetch: Start prefetch service based on build" into main am: 3ffdc6206a

Original change: https://android-review.googlesource.com/c/platform/system/core/+/3368783

Change-Id: I8bc54460b5d966b59ab4f3192b7534c4c6b2d302
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>