!15630 Set none for self.param_info

From: @irmo
Reviewed-by: @ginfung,@zh_qh
Signed-off-by: @zh_qh

mindspore/common/parameter.py

@@ -609,3 +609,6 @@ class ParameterTuple(tuple):
 
     def __parameter_tuple__(self):
         """For parse check."""
+
+    def __del__(self):
+        self.param_info = None