Add OWNERS file for power AIDL. am: 54f0b5287e am: 6b4861ca13

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

Change-Id: I26c9e4c1d56bfe23f7e5f3e1457425aac2bccf4a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>