BaseTools: Modify class OrderedListDict

BaseTools: Modify class OrderedListDict

class OrderedListDict(OrderedDict, defaultdict) will
encounter multiple bases have instance lay-out
conflict error on python3

Cc: Liming Gao <liming.gao@intel.com>
Cc: Yonghong Zhu <yonghong.zhu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Yunhua Feng <yunhuax.feng@intel.com>
Reviewed-by: Yonghong Zhu <yonghong.zhu@intel.com>