[feature]Ascend quantization support (#7791)

Co-authored-by: ichernob <ichernobnn@gmail.com>
Co-authored-by: liupeng <liupeng374@huawei.com>

python/sglang/srt/configs/model_config.py

@@ -413,7 +413,9 @@ class ModelConfig:
         quant_cfg = self._parse_quant_hf_config()
 
         if quant_cfg is not None:
-            quant_method = quant_cfg.get("quant_method", "").lower()
+            quant_method = quant_cfg.get(
+                "quant_method", "" if not self.quantization else self.quantization
+            ).lower()
 
             # Detect which checkpoint is it
             for _, method in QUANTIZATION_METHODS.items():