[Bugfix] Fix disaggregated pd error (#2242)

### What this PR does / why we need it?
Fix `ascend_env has no attr VLLM_ASCEND_ENABLE_CHUNK_MC2`, remove
useless lines

- vLLM version: v0.10.0
- vLLM main:
vllm-project/vllm@9edd1db

---------

Signed-off-by: wangli <[email protected]>

Author: Potabk

vllm_ascend/worker/model_runner_v1.py

@@ -646,22 +646,6 @@ def _get_forward_metadata_across_dp_and_pad(
                 return maybe_padded_num_tokens, None, with_prefill, enable_dbo
             return num_tokens, None, with_prefill, enable_dbo
 
-        if self.is_kv_producer and not envs_ascend.VLLM_ASCEND_ENABLE_CHUNK_MC2:
-            num_tokens_across_dp = torch.tensor([num_tokens] * self.dp_size,
-                                                device="cpu",
-                                                dtype=torch.int32)
-            return num_tokens, num_tokens_across_dp, True, enable_dbo
-
-        if self.is_kv_consumer and self.torchair_graph_enabled and len(
-                self.torchair_graph_batch_sizes
-        ) == 1 and not self.in_profile_run:
-            max_num_decode_tokens = self.torchair_graph_batch_sizes[0]
-            num_tokens_across_dp = torch.tensor([max_num_decode_tokens] *
-                                                self.dp_size,
-                                                device="cpu",
-                                                dtype=torch.int32)
-            return max_num_decode_tokens, num_tokens_across_dp, False, enable_dbo
-
         maybe_padded_num_tokens = num_tokens
         num_tokens_across_dp, with_prefill, enable_dbo = self._get_forward_metadata_across_dp(
             num_tokens, with_prefill, enable_dbo)