[automerger skipped] power/stats: Add VTS tests for power stats hal am:...

[automerger skipped] power/stats: Add VTS tests for power stats hal am: c357e98d am: 3130674a am: a0f917e8 -s ours

am skip reason: Change-Id Iba90d106a5be13d817a4a2fb36098781ea2f9ee0 with SHA-1 5e3298c3 is in history

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/1576533

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I7c51a685ce54292d4997efc22690d2fde87ea3bc