Introduce CPUFREQ_RELATION_C for frequency selection.
It selects the frequency with the minimum euclidean distance to target.
In case of equal distance between 2 frequencies, it will select the
greater frequency.
Signed-off-by: NStratos Karafotis <stratosk@semaphore.gr>
Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>