Add FL6 spec tests to AIDL VTS. am: ca46f9768c am: 65a058482b am: 1a1d9d0325

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/1866682

Change-Id: I2188510948e8964f4a4c8e33648f6a960914d01b