Suppress gtest error for tests without any instance am: 4a916991 am:...

Suppress gtest error for tests without any instance am: 4a916991 am: 18833972 am: 5555914f am: fdc35e20

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/1378657

Change-Id: I4b0321e5f1de0fb318471d46f37fe5630a15c543