Reduce coupling between DefaultPermissionGrantPolicy and PM

This is a refactoring that should help us eventually split
DefaultPermissionGrantPolicy away from package manager
Specifically, this CL:
  - Removes usages of PM-internal APIs from DPGP, such as
    PackageParser.Package and PackageList
  - Introduces APIs in PackageManagerInternal to replace the above
  - Removes PackageManagerService as a middleman for default
    sms and dialer app changes

This intentionally doesn't move DPGP yet, to make it easier to review what actually changed

Test: gts-tradefed run gts -m GtsPermissionTestCases -t com.google.android.permission.gts.DefaultPermissionGrantPolicyTest
Change-Id: Iff5b1a6b97888c496d982cf2ce656b58ed0a31a6