[2/N][Pangu][MoE] Remove Pangu Related Code (#5130)

### What this PR does / why we need it?
Remove Pangu Related Code

### Does this PR introduce _any_ user-facing change?
No

### How was this patch tested?
e2e & ut

- vLLM version: v0.12.0
- vLLM main:
ad32e3e19c

---------

Signed-off-by: weichen <calvin_zhu0210@outlook.com>

vllm_ascend/quantization/utils.py

@@ -9,8 +9,7 @@ from .w4a4_flatquant_dynamic import AscendW4A4FlatQuantDynamicLinearMethod
 from .w4a8_dynamic import (AscendW4A8DynamicFusedMoEMethod,
                            AscendW4A8DynamicLinearMethod)
 from .w4a16 import AscendW4A16FusedMoEMethod
-from .w8a8 import (AscendC8KVCacheMethod, AscendW8A8FusedMoEMethod,
-                   AscendW8A8LinearMethod)
+from .w8a8 import AscendW8A8LinearMethod
 from .w8a8_dynamic import (AscendW8A8DynamicFusedMoEMethod,
                            AscendW8A8DynamicLinearMethod)
 from .w8a8_pdmix import (AscendW8A8PDMixFusedMoeMethod,
@@ -29,8 +28,6 @@ ASCEND_QUANTIZATION_METHOD_MAP: Dict[str, Dict[str, Type[Any]]] = {
     },
     "W8A8": {
         "linear": AscendW8A8LinearMethod,
-        "moe": AscendW8A8FusedMoEMethod,
-        "attention": AscendC8KVCacheMethod,
     },
     "W8A8_DYNAMIC": {
         "linear": AscendW8A8DynamicLinearMethod,
@@ -39,10 +36,7 @@ ASCEND_QUANTIZATION_METHOD_MAP: Dict[str, Dict[str, Type[Any]]] = {
     "W8A8_MIX": {
         "linear": AscendW8A8PDMixLinearMethod,
         "moe": AscendW8A8PDMixFusedMoeMethod,
-    },
-    "C8": {
-        "attention": AscendC8KVCacheMethod,
-    },
+    }
 }
 
 
@@ -100,9 +94,6 @@ def get_quant_method_modelslim(
     # Attention
     if '.attn' in prefix and 'fa_quant_type' in quant_description.keys():
         quant_type = quant_description['fa_quant_type']
-    # Use KVCache int8
-    elif '.attn' in prefix and 'kv_quant_type' in quant_description.keys():
-        quant_type = quant_description['kv_quant_type']
     # Linear
     else:
         quant_type = get_linear_quant_type(quant_description, prefix,