!11732 bert scripts modify to extract embedding tables in construct

From: @shibeiji
Reviewed-by: @linqingke,@c_34
Signed-off-by: @c_34

model_zoo/official/nlp/bert/src/bert_model.py

@@ -805,7 +805,6 @@ class BertModel(nn.Cell):
             vocab_size=config.vocab_size,
             embedding_size=self.embedding_size,
             use_one_hot=use_one_hot_embeddings)
-        self.embedding_tables = self.bert_embedding_lookup.embedding_table
 
         self.bert_embedding_postprocessor = EmbeddingPostprocessor(
             embedding_size=self.embedding_size,
@@ -847,7 +846,7 @@ class BertModel(nn.Cell):
     def construct(self, input_ids, token_type_ids, input_mask):
         """Bidirectional Encoder Representations from Transformers."""
         # embedding
-        embedding_tables = self.embedding_tables
+        embedding_tables = self.bert_embedding_lookup.embedding_table
         word_embeddings = self.bert_embedding_lookup(input_ids)
         embedding_output = self.bert_embedding_postprocessor(token_type_ids,
                                                              word_embeddings)