[Bugfix][310p] the new A5 mmencoder op donot support 310p (#7518)

### What this PR does / why we need it?

Because the new A5 MMEncoder operator was merged, the 310P can no longer
run any VL models. This PR fixes that issue. details at #7046

### Does this PR introduce _any_ user-facing change?
no
### How was this patch tested?
e2e
- vLLM version: v0.17.0
- vLLM main:
8b6325758c

---------

Signed-off-by: Tflowers-0129 <2906339855@qq.com>

vllm_ascend/utils.py

@@ -662,6 +662,7 @@ def register_ascend_customop(vllm_config: VllmConfig | None = None):
         from vllm_ascend._310p.fused_moe.fused_moe import AscendFusedMoE310, AscendSharedFusedMoE310
         from vllm_ascend._310p.ops.activation import AscendSiluAndMul310
         from vllm_ascend._310p.ops.layernorm import AscendGemmaRMSNorm310, AscendRMSNorm310
+        from vllm_ascend._310p.ops.mm_encoder_attention import AscendMMEncoderAttention310
         from vllm_ascend._310p.ops.rotary_embedding import AscendRotaryEmbedding310
         from vllm_ascend._310p.ops.vocab_parallel_embedding import (
             AscendParallelLMHead310,
@@ -678,6 +679,7 @@ def register_ascend_customop(vllm_config: VllmConfig | None = None):
                 "SharedFusedMoE": AscendSharedFusedMoE310,
                 "ParallelLMHead": AscendParallelLMHead310,
                 "VocabParallelEmbedding": AscendVocabParallelEmbedding310,
+                "MMEncoderAttention": AscendMMEncoderAttention310,
             }
         )