[PATCH 2/2] IPS driver: disable CPU turbo

The undocumented interface we're using for reading CPU power seems to be
overreporting power.  Until we figure out how to correct it, disable CPU
turbo and power reporting to be safe.  This will keep the CPU within default
limits and still allow us to increase GPU frequency as needed.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Matthew Garrett <mjg@redhat.com>