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

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

Change-Id: I1530ca46aebfeb97e60ab12a1daf95a926f59834
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>