UefiCpuPkg: ResetVector Tool Support for Python 3

UefiCpuPkg: ResetVector Tool Support for Python 3

REF:https://bugzilla.tianocore.org/show_bug.cgi?id=3506

Build Scrips for Reset Vector currently based on Python 2
which is already EOL, needs to modify the build script based on
Python 3

Reviewed-by: Ray Ni <ray.ni@intel.com>
Cc: Rahul Kumar <rahul1.kumar@intel.com>
Cc: Debkumar De <debkumar.de@intel.com>
Cc: Harry Han <harry.han@intel.com>
Cc: Catharine West <catharine.west@intel.com>
Cc: Sangeetha V <sangeetha.v@intel.com>
Signed-off-by: Ashraf Ali S <ashraf.ali.s@intel.com>