Don't copy prebuilt implementation libs that should be built from am: 57e81e257b

Original change: https://android-review.googlesource.com/c/platform/art/+/2201639

Change-Id: I12d6e527a4268a96cdcb25867408f5e4aa7dd0d3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>