VintfObjectTest: never fetch real properties

In the old code, the test fetches real values of properties
by default. This makes the test inconsistent across devices.
Remove such logic.

Test: run vintf_object_test on b1c1
Change-Id: I21589cc83cd153d2ec8b136f5e7b20bd39355f12
Fixes: 121205339
3 files changed