remove unused mla utils.py

vllm/attention/backends/mla/common.py

@@ -1297,7 +1297,7 @@ class MLACommonImpl(MLAAttentionImpl[T], Generic[T]):
             output = self.flash_attn_varlen_func(
                 q=q,
                 k=k,
-                v=v_padded,
+                v=v,
                 cu_seqlens_q=prefill_metadata.query_start_loc,
                 cu_seqlens_k=prefill_metadata.query_start_loc,
                 max_seqlen_q=prefill_metadata.max_prefill_seq_len,
@@ -1323,8 +1323,10 @@ class MLACommonImpl(MLAAttentionImpl[T], Generic[T]):
             )
 
         # slice by `:v.shape[-1]` in order to remove v headdim padding
+        # output = output\
+        #     .view(-1, self.num_heads, q.shape[-1])[..., :v.shape[-1]]\
+        #         .reshape(-1, self.num_heads * v.shape[-1])
         output = output\
-            .view(-1, self.num_heads, q.shape[-1])[..., :v.shape[-1]]\
                 .reshape(-1, self.num_heads * v.shape[-1])
 
         return self.o_proj(output)[0]