[main][Refactor] Remove with_prefill parameter from set_ascend_forward_context (#5094)

Removes the redundant `with_prefill` parameter from
`set_ascend_forward_context` to align the interface with vLLM's
`set_forward_context` for future refactoring.
- vLLM version: v0.12.0
- vLLM main:
ad32e3e19c

---------

Signed-off-by: SlightwindSec <slightwindsec@gmail.com>
Signed-off-by: Slightwind <slightwindsec@gmail.com>
Co-authored-by: zzzzwwjj <34335947+zzzzwwjj@users.noreply.github.com>

vllm_ascend/ascend_forward_context.py

@@ -31,7 +31,6 @@ def set_ascend_forward_context(
         virtual_engine: int = 0,
         num_tokens: int = 0,
         num_tokens_across_dp: Optional[torch.Tensor] = None,
-        with_prefill: bool = True,
         in_profile_run: bool = False,
         num_actual_tokens: Optional[int] = None,
         aclgraph_runtime_mode: CUDAGraphMode = CUDAGraphMode.NONE,
@@ -60,7 +59,6 @@ def set_ascend_forward_context(
         forward_context.moe_comm_type = moe_comm_type
         forward_context.moe_comm_method = get_moe_comm_method(moe_comm_type)
 
-        forward_context.with_prefill = with_prefill
         tp_world_size = get_tensor_model_parallel_world_size()
 
         forward_context.in_profile_run = in_profile_run