[Core] Cleanup triton patch which has been fixed in vllm (#764)

### What this PR does / why we need it?
- Revert "Re-patch TritonPlaceholder on main to make CI happy (#753)"
because upstream main CI already merged:
vllm-project/vllm#17446
- Keep 0.8.5.post1 compatible

### Does this PR introduce _any_ user-facing change?
No

### How was this patch tested?
CI passed

---------

Signed-off-by: Yikun Jiang <yikunkero@gmail.com>

Author: Yikun

vllm_ascend/__init__.py

@@ -23,9 +23,5 @@ def register():
 
 
 def register_model():
-    # TODO: fixme when TritonPlaceholder fixed
-    from vllm_ascend.utils import vllm_version_is
-    if not (vllm_version_is("0.8.5") or vllm_version_is("0.8.5.post1")):
-        import vllm_ascend.patch.worker.patch_main.patch_tritonplaceholder  # noqa
     from .models import register_model
     register_model()

vllm_ascend/patch/__init__.py

@@ -158,15 +158,4 @@
 #       - https://github.com/vllm-project/vllm-ascend/pull/395
 #    Future Plan:
 #       Revert it when the related pr is merged in vllm and vllm-ascend.
-#
-# ** File: worker/patch_main/patch_tritonplaceholder.py **
-# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-#   1. `triton` Module
-#    Why:
-#       Triton is not supported on npu currently, importing triton will break vllm-ascend
-#    How：
-#       ditto
-#    Related PR (if no, explain why): vllm haven't support yet
-#       TritonPlaceholder is only available in vllm>0.8.5.post1
-#    Future Plan:
-#       https://github.com/vllm-project/vllm/pull/17446
+#

vllm_ascend/patch/worker/__init__.py

@@ -22,5 +22,5 @@
     from vllm_ascend.patch.worker import patch_0_8_5  # noqa: F401
     from vllm_ascend.patch.worker import patch_common  # noqa: F401
 else:
-    from vllm_ascend.patch.worker import patch_main  # noqa: F401 # isort:skip
     from vllm_ascend.patch.worker import patch_common  # noqa: F401
+    from vllm_ascend.patch.worker import patch_main  # noqa: F401

vllm_ascend/patch/worker/patch_main/__init__.py

@@ -13,5 +13,4 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-#
-import vllm_ascend.patch.worker.patch_main.patch_tritonplaceholder  # noqa
+#