[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>

tests/ut/patch/worker/patch_common/test_patch_distributed.py

@@ -19,8 +19,7 @@ import torch
 from vllm.distributed.parallel_state import GroupCoordinator
 
 from tests.ut.base import TestBase
-from vllm_ascend.patch.worker.patch_common.patch_distributed import \
-    GroupCoordinatorPatch
+from vllm_ascend.patch.worker.patch_distributed import GroupCoordinatorPatch
 
 
 class TestPatchDistributed(TestBase):

tests/ut/patch/worker/patch_common/test_patch_minicpm.py

@@ -18,7 +18,7 @@ from unittest.mock import MagicMock
 import torch
 
 from tests.ut.base import TestBase
-from vllm_ascend.patch.worker.patch_common.patch_minicpm import forward
+from vllm_ascend.patch.worker.patch_minicpm import forward
 
 
 class TestPatchMiniCPM(TestBase):