[Misc][V0 Deprecation] Remove V0 Related Custom Ops (#1871)

### What this PR does / why we need it?
This PR is a part of
https://github.com/vllm-project/vllm-ascend/issues/1620.

- vLLM version: v0.9.2
- vLLM main:
ca4eb82bcb

---------

Signed-off-by: shen-shanshan <467638484@qq.com>

csrc/ops.h

@@ -60,16 +60,4 @@ namespace vllm_ascend {
     auto new_tensor = at_npu::native::from_blob(data_ptr, sizes, strides, options);
     return new_tensor;
   }
-    extern void launch_advance_step_flashattn(
-        void* stream,
-        int64_t num_seqs,
-        int64_t num_queries,
-        int64_t block_size,
-        int64_t* input_tokens_ptr,
-        int64_t* sampled_token_ids_ptr,
-        int64_t* input_positions_ptr,
-        int32_t* seq_lens_ptr,
-        int32_t* slot_mapping_ptr,
-        int32_t* block_tables_ptr,
-        int64_t block_tables_stride);
 }