Audio VTS:  Fix empty parameter list failures for AudioV6 am: 1eb1f36877 am: 0c0bdf4db2 am: 58a2095cc0 am: 10828b9168 am: ae7a061916

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/1382482

Change-Id: Ib05eebfef03e1152b306636593c141a81c623973