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/Scripts/PackageDocumentTools/plugins/EdkPlugins/basemodel/efibinary.py

@@ -553,7 +553,7 @@ class EfiFvMapFile(object):
             if line[0] != ' ':
                 # new entry
                 ret = rMapEntry.match(line)
-                if ret != None:
+                if ret is not None:
                     name     = ret.groups()[0]
                     baseaddr = int(ret.groups()[1], 16)
                     entry    = int(ret.groups()[2], 16)