Prepare to move AttributedOp out of AppOpsService

These were preparation steps necessary before IntelliJ's refactoring
tools would work to move the AttributedOp class out of AppOpsService. The
steps were:

- Injected AppOpsService into AttributedOp.
- Any fields (or inner-classes) of AppOpsService that are directly
  referenced from AttributedOp were either changed from private to
  package-private, or changed to be accessed by getters/setters.

Test: presubmit
Change-Id: Ia725264c8dac07a4f0855f08af3cd2f3281a3b7e