Update references to AM and Job OWNERS

In previous changes we added nuance to the /am/ and /apex/JobScheduler/ OWNERS files to help differentiate who owns which parts of those directories. This change utilizes the new ownership slices in other parts of the frameworks/base repo

Change-Id: Ia7b6781e6d21c428bafebde913bd79afdd3d1fe0
Flag: EXEMPT only changing OWNERS
Bug: 360381361