Mark sun.misc.Unsafe APIs as stable

Bug: 154796679
Test: m stable.art.module.platform.api.stubs.source-update-current-api
      m legacy.art.module.platform.api.stubs.source-update-current-api
Test: m update-api
Change-Id: Ia2a208cb822c9a5d698550563a45ba28e4f6d93f
3 files changed