autotest: power_x86Settings: refactor cpu_type.

Refactored cpu_type method to power_utils.py module so it can be
shared.

Additionally,
1. fixed copyright year
2. renamed key from cpuAtom & cpuCore to Atom & Non-Atom as thats
   really the difference presently

BUG=chromium-os:31503
TEST=run power_x86Settings on Atom and Non-Atom hosts

Change-Id: I78b461a59e56736ceb2132106a236167a448d819
Reviewed-on: https://gerrit.chromium.org/gerrit/24760
Tested-by: Todd Broch <tbroch@chromium.org>
Reviewed-by: Mark Koudritsky <kamrik@chromium.org>
Commit-Ready: Todd Broch <tbroch@chromium.org>
2 files changed