powertop: upgraded package to upstream

Upgraded sys-power/powertop to version 2.6 on all platforms

TEST=see below
build the image for amd64, arm and x86 using build_packages and
build_image boot the image on the test machines and check version
of powertop using `powertop --version`. Check if powertop
is collecting data.

Change-Id: I87ec320baff87b516e00048b75761e361c8bb020
Reviewed-on: https://chromium-review.googlesource.com/208376
Reviewed-by: Gaurav Shah <gauravsh@chromium.org>
Reviewed-by: James Ausmus <james.ausmus@intel.com>
Commit-Queue: James Ausmus <james.ausmus@intel.com>
Tested-by: James Ausmus <james.ausmus@intel.com>
10 files changed