Dumpstate: default service implementation.

- dumpstate will not have passthrough mode. All new implementations are
  required anyway. It makes more sense to just have them binderized by
  default.

Test: compiles/put on device in right location/running
Bug: 31982882
Change-Id: Ib0c12a2e0da931060f0e9e990fb63b6c7bc9e872