Revert "Add mrope op fusion (#3509)" (#3562)

This reverts commit 646c1db5d7.

this new ops may lead accuracy problem

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

### Does this PR introduce _any_ user-facing change?

### How was this patch tested?

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

vllm_ascend/ops/rotary_embedding.py

@@ -22,7 +22,7 @@ import torch
 import torch_npu
 from vllm.forward_context import get_forward_context
 from vllm.model_executor.layers.rotary_embedding import (
-    DeepseekScalingRotaryEmbedding, MRotaryEmbedding, RotaryEmbedding,
+    DeepseekScalingRotaryEmbedding, RotaryEmbedding,
     YaRNScalingRotaryEmbedding)
 
 from vllm_ascend.platform import NPUPlatform
@@ -395,37 +395,3 @@ class AscendDeepseekScalingRotaryEmbedding(DeepseekScalingRotaryEmbedding):
         q_pe, k_pe = _rope_forward_oot(self, positions, query, key,
                                        is_neox_style, offsets)
         return q_pe, k_pe
-
-
-class AscendMRotaryEmbedding(MRotaryEmbedding):
-
-    def forward_oot(
-        self,
-        positions: torch.Tensor,
-        query: torch.Tensor,
-        key: torch.Tensor,
-    ):
-        if self.mrope_section != [16, 24, 24]:
-            return super().forward_oot(positions, query, key)
-
-        import torch_npu
-        mrope_section = [0, 0, 0
-                         ] if positions.ndim == 1 else self.mrope_section
-
-        if self.cos_sin_cache.device != query.device:  # type: ignore
-            self.cos_sin_cache = self.cos_sin_cache.to(  # type: ignore
-                query.device)  # type: ignore
-
-        if self.cos_sin_cache.dtype != query.dtype:  # type: ignore
-            self.cos_sin_cache = self.cos_sin_cache.to(  # type: ignore
-                query.dtype)  # type: ignore
-
-        query, key = torch_npu.npu_mrope(positions,
-                                         query.contiguous(),
-                                         key.contiguous(),
-                                         self.cos_sin_cache.contiguous(),
-                                         self.head_size,
-                                         mrope_section=mrope_section,
-                                         rotary_mode='half')
-
-        return query, key