Add tests for whitelisting of preinstalled packages on OTA.

As this test mocks out the environment it has to intercept quite a few
calls. Unfortunately this test cannot be written as a black box test as
it requires an OTA.

Test: atest PermissionControllerMockingTests PermissionControllerInProcessTests
Bug: 155019930
Change-Id: I8e90f69743871df69dfe1f1095feb9394e12f95e
Merged-In: I8e90f69743871df69dfe1f1095feb9394e12f95e