Enable cpp support for IPowerStats AIDL interface am: 5aae5cb79d am: 6e92dab27b am: d43cbbee5f am: c11c9708c5

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/1628872

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Ib9344574b70e7a6750c75f09a83f644e946cfc1a