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/MkPkg.py

@@ -73,7 +73,7 @@ def CheckForExistingDp(Path):
 #
 #
 def Main(Options = None):
-    if Options == None:
+    if Options is None:
         Logger.Error("\nMkPkg", OPTION_UNKNOWN_ERROR, ST.ERR_OPTION_NOT_FOUND)
     try:
         DataBase = GlobalData.gDB