power: Relocate old utility code.

Relocate some shared code that's no longer shared.

BUG=none
TEST=unit tests pass

Change-Id: Iaeb25fbaa21aa090409321e960b95f64980f8fe6
Reviewed-on: https://chromium-review.googlesource.com/181391
Reviewed-by: Daniel Erat <derat@chromium.org>
Commit-Queue: Daniel Erat <derat@chromium.org>
Tested-by: Daniel Erat <derat@chromium.org>
7 files changed