Refactor Power VTS in terms of AIDL version am: 87f9c220b5 am: ff11987e32

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/3298492

Change-Id: I9f125f59a2371dfe933b5464f65f3d2fb5b49b5a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>