Audio: Add VTS tests for invalid enum-strings, Part 1b am: 9139399bad am: 45e6ec48c9

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/1543608

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I77b89e24613cdb6fb120dfbbaadffda35f6012e3