[Refactor] refactor patch module (#3555)

### What this PR does / why we need it?
we notice that `patch_main` is never used. Usually the patch is for all
version. And if it's for specified version, we can use `vllm_version_is`
instead. So let's remove the useless sub folder in patch module to make
it clear.


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

Signed-off-by: wangxiyuan <wangxiyuan1007@gmail.com>

vllm_ascend/patch/worker/patch_logits.py

@@ -0,0 +1,26 @@
+import torch
+import vllm
+from vllm._custom_ops import apply_repetition_penalties_torch
+
+
+def apply_repetition_penalties(logits: torch.Tensor, prompt_mask: torch.Tensor,
+                               output_mask: torch.Tensor,
+                               repetition_penalties: torch.Tensor) -> None:
+    """Apply repetition penalties to logits in-place.
+
+    Args:
+        logits: The logits tensor of shape [num_seqs, vocab_size].
+        prompt_mask: A boolean tensor indicating which tokens appear in the prompt.
+        output_mask: A boolean tensor indicating which tokens appear in the output.
+        repetition_penalties: The repetition penalties of shape (num_seqs, ).
+    """
+    apply_repetition_penalties_torch(logits, prompt_mask, output_mask,
+                                     repetition_penalties)
+
+
+# NPU device type tensors have attributes is_cuda=True and is_npu=True, according to its implementation in
+# https://github.com/Ascend/pytorch/blob/863b9071cbdf47023c12c246e3efa9c6e2285fc6/torch_npu/npu/_stream_check.py#L74
+# This causes that vLLM's apply_repetition_penalties function will run into the branch of "if logits.is_cuda" and
+# call the custom op implemented in CUDA, which is not compatible with NPU.
+# Reference: https://github.com/vllm-project/vllm/blob/f66673a39d9f364194c249f28098cad8a5584ccb/vllm/_custom_ops.py#L314
+vllm._custom_ops.apply_repetition_penalties = apply_repetition_penalties