Add logic to actually read OBD2 sensor properties to VehicleHidlTest

Test: make vts BUILD_GOOGLE_VTS=true -j32 && vts-tradefed run commandAndExit vts --skip-all-system-status-check --primary-abi-only --skip-preconditions --module VehicleHidlTest -l INFO

Change-Id: I0817823ea00354b27c90bdd412012320868b9e8f