tools/power/turbostat: Abstract Automatic Cstate Conversion support

Abstract the support for AUTOMATIC_CSTATE_CONVERSION bit in
MSR_PKG_CST_CONFIG_CONTROL.

Delete automatic_cstate_conversion_probe() CPU model check.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Reviewed-by: Len Brown <len.brown@intel.com>