Based on cpufv text from sysfs-platform-eeepc-laptop that
has almost same behavior.
Signed-off-by: NChris Bagwell <chris@cnpbagwell.com>
Signed-off-by: NMatthew Garrett <mjg@redhat.com>
Acked-by: NCorentin Chary <corentincj@iksaif.net>