Suppress gtest error for tests without any instance am: ba4d532f am:...

Suppress gtest error for tests without any instance am: ba4d532f am: 73122cd2 am: e5c9b5e7 am: 1a52c0eb

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/1374050

Change-Id: I474b87b3697ea787c0f9be246c13a0d71248141f