Add OWNERS file for power AIDL. am: 54f0b5287e

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/2220004

Change-Id: If2840fffb0b75c9061f5bb52ee9141cf4c7dcb76
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>