Revert "Package dexpreopt artifacts for libcore jars in the ART apex."

This reverts commit d5df9493.

Bug: 143594594
Bug: 143593500
Reason for revert: Some builds are failing.

Change-Id: I69986b472bce39266095e526fcd7ef5f48ece85e
Exempt-From-Owner-Approval: Going back to green.