[Bugfix] Fix the bug of cos invalid shape when dp

Signed-off-by: weiguihua2 <weiguihua2@huawei.com>

Author: weiguihua2

vllm_ascend/torchair/torchair_model_runner.py

@@ -419,3 +419,7 @@ def check_torchair_graph_batch_sizes(self):
 
     def _build_drafter_prepare_inputs_torchair_param(self):
         return True
+
+    def get_dp_padding(self, num_tokens):
+        """Override from NPUModelRunner to get dp padding"""
+        return 0, None