[Bugfix]modify the enable range of _merge_multimodal_embeddings patch (#3360)

### What this PR does / why we need it?
Modify the enable range of _merge_multimodal_embeddings patch. The
current patch is only enabled for offline inference on the platform. For
online serviceization, due to the addition of the worker sub-process, it
is not enabled within the sub-process.
### Does this PR introduce _any_ user-facing change?
None
### How was this patch tested?

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

Signed-off-by: booker123456 <945658361@qq.com>

vllm_ascend/patch/__init__.py

@@ -56,7 +56,7 @@
 #    Future Plan:
 #       Find a better way to support tensor alignment for 310p without this patch.
 #
-# ** File: platform/patch_common/patch_multimodal_merge.py**
+# ** File: worker/patch_common/patch_multimodal_merge.py**
 # ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 #   1. `vllm.model_executor.models.utils._merge_multimodal_embeddings`
 #    Why:

vllm_ascend/patch/platform/patch_common/__init__.py

@@ -18,6 +18,5 @@
 import vllm_ascend.patch.platform.patch_common.patch_config  # noqa
 import vllm_ascend.patch.platform.patch_common.patch_distributed  # noqa
 import vllm_ascend.patch.platform.patch_common.patch_mamba_config  # noqa
-import vllm_ascend.patch.platform.patch_common.patch_multimodal_merge  # noqa
 import vllm_ascend.patch.worker.patch_common.patch_attention_selector  # noqa
 import vllm_ascend.patch.worker.patch_common.patch_attentionspec  # noqa

vllm_ascend/patch/worker/patch_common/__init__.py

@@ -27,6 +27,7 @@ import vllm_ascend.patch.worker.patch_common.patch_attention_layer  # noqa
 import vllm_ascend.patch.worker.patch_common.patch_distributed  # noqa
 import vllm_ascend.patch.worker.patch_common.patch_logits  # noqa
 import vllm_ascend.patch.worker.patch_common.patch_weight_loader  # noqa
+import vllm_ascend.patch.worker.patch_common.patch_multimodal_merge  # noqa
 
 # TODO: revert me when triton import is fixed
 # import vllm_ascend.patch.worker.patch_common.patch_minicpm  # noqa