OtaDexoptService: Run dexopt on all apps

To avoid work after reboot, dexopt all apps. However, unimportant
apps are optimized with the first-boot reason (which is usually
interpret-only) for space reasons.

Bug: 30468718
Change-Id: Ia05d879957388967c69f9380e50d8a9834afe07d
(cherry picked from commit 115514b2)