tools/power/x86/intel-speed-select: Support large clos_min/max

clos_min/max in TPMI interface is frequency in MHz, thus clos_min/max
needs to support larger values.

No functional changes are expected.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
[srinivas.pandruvada@linux.intel.com: changelog edits]
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>