Merge "power/stats: Return exception codes on error" am: 777542355a am: 3dd0588218

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/1626963

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I2a54a2ed50c042858dbc774b259df7811b06b7a6