Create mocking test for SensorPrivacyService

The current test verifies that the service parses the persisted state and
initializes successfully.

Test: Checkout multiple previous manifests and cherry pick this and run
          `atest SensorPrivacyServiceMockingTest`.
Bug: 186904124
Change-Id: I2990910daa6f240655ba09686e4f5e489dd10995
9 files changed