[CustomOp] Register VocabParallelEmbedding instead of overwrite forward (#2515)

### What this PR does / why we need it?
Register VocabParallelEmbedding instead of overwrite forward

### Does this PR introduce _any_ user-facing change?
N/A

### How was this patch tested?
CI passed with new added/existing test.

- vLLM version: v0.10.1.1
- vLLM main:
644d57d531

---------

Signed-off-by: Icey <1790571317@qq.com>

vllm_ascend/utils.py

@@ -512,6 +512,11 @@ def register_ascend_customop():
     from vllm_ascend.ops.common_fused_moe import AscendFusedMoE
     CustomOp.register_oot(_decorated_op_cls=AscendFusedMoE, name="FusedMoE")
 
+    from vllm_ascend.ops.vocab_parallel_embedding import \
+        AscendVocabParallelEmbedding
+    CustomOp.register_oot(_decorated_op_cls=AscendVocabParallelEmbedding,
+                          name="VocabParallelEmbedding")
+
     # NOTE: Keep this at last to ensure all custom actions are registered
     _ASCEND_CUSTOMOP_IS_REIGISTERED = True