Add service registerer for "artd_pre_reboot" and "dexopt_chroot_setup".

Design doc: http://go/art-service-pre-reboot-dexopt

The service definition and SELinux policy changes will follow.

Bug: 323856574
Test: m update-api
Change-Id: I7cf1fda0bf361a26656b4a18c640a245b95ff5e7
2 files changed