[Fix] Fix SharedFusedMoE (#2817)

### What this PR does / why we need it?
Really strange that `register_oot` doesn't work with `SharedFusedMoE`,
so we have to add this patch, for now.

### Does this PR introduce _any_ user-facing change?
None.

### How was this patch tested?
This PR won't have any effect in DeepSeek since we currently still stick
with the old `CustomDeepseekV2`.

- vLLM version: v0.10.1.1
- vLLM main:
0cdd213641

---------

Signed-off-by: Yizhou Liu <liu_yizhou@outlook.com>

vllm_ascend/patch/platform/patch_common/__init__.py

@@ -16,3 +16,4 @@
 #
 
 import vllm_ascend.patch.platform.patch_common.patch_distributed  # noqa
+import vllm_ascend.patch.platform.patch_common.patch_shared_fused_moe  # noqa

vllm_ascend/patch/platform/patch_common/patch_shared_fused_moe.py

@@ -0,0 +1,21 @@
+# Copyright (c) 2025 Huawei Technologies Co., Ltd. All Rights Reserved.
+# Copyright 2023 The vLLM team.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# 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.
+
+from vllm.model_executor.models import deepseek_v2, llama4
+
+from vllm_ascend.ops.common_fused_moe import AscendSharedFusedMoE
+
+deepseek_v2.SharedFusedMoE = AscendSharedFusedMoE
+llama4.SharedFusedMoE = AscendSharedFusedMoE