BaseTools: AutoGen - refactor out a useless class
    
    this class was never instantiated.  the static function was called.
    save the function, remove the rest.
    
    Cc: Liming Gao <liming.gao@intel.com>
    Cc: Yonghong Zhu <yonghong.zhu@intel.com>
    Contributed-under: TianoCore Contribution Agreement 1.1
    Signed-off-by: Jaben Carsey <jaben.carsey@intel.com>
    Reviewed-by: Yonghong Zhu <yonghong.zhu@intel.com>