[BugFix] Fix kv_no_split not contiguous (#3711)

allgather need contiguous data, split operation return uncontiguous
data.

- vLLM version: v0.11.0rc3
- vLLM main: https://github.com/vllm-project/vllm/commit/v0.11.0

Signed-off-by: zhaozx-cn <[email protected]>

Author: zhaozx-cn

vllm_ascend/attention/mla_v1.py

@@ -1166,6 +1166,8 @@ def _mla_preprocess(self, layer_name, hidden_states, kv_cache,
                 dim=-1,
             )
             q_c = self.q_a_layernorm(q_c)
+            # allgather need contiguous data
+            kv_no_split = kv_no_split.contiguous()
         else:
             q_c = hidden_states
             kv_no_split = self.kv_a_proj_with_mqa(hidden_states)[0]