powerstats: add OWNERS for power stats am: 7885d61cd4

Original change: https://android-review.googlesource.com/c/device/google/gs-common/+/2375575

Change-Id: Id04a3d47774ade828a7ea0c8c834a225f1669e6f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>