tools/power/x86/intel-speed-select: Make CLOS frequency in MHz

To be consistant with the other frequency units, change the CLOS
unit to MHz instead of ratios.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>