BaseTools: Remove equality operator with None

replace "== None" with "is None" and "!= None" with "is not None"

Cc: Yonghong Zhu <yonghong.zhu@intel.com>
Cc: Liming Gao <liming.gao@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>

BaseTools/Source/Python/UPT/Xml/ModuleSurfaceAreaXml.py

@@ -550,7 +550,7 @@ class ModulePropertyXml(object):
             Hob = Axml.FromXml(SubItem, 'HOB')
             self.HOBs.append(Hob)
 
-        if Header == None:
+        if Header is None:
             Header = ModuleObject()
 
         Header.SetModuleType(self.ModuleType)