new modelslim quantization model support v0.7.3 (#743)

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

In order to support quantization model generated by new modelslim
version, we need to add quant_description in `AscendQuantConfig`.
cherry-pick this PR from
#719

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

no

### How was this patch tested?
 test locally

Signed-off-by: ganyi <[email protected]>

Author: ganyi1996ppo

vllm_ascend/quantization/quant_config.py

@@ -70,7 +70,7 @@ def get_min_capability(cls) -> int:
 
     @classmethod
     def get_config_filenames(cls) -> List[str]:
-        return []
+        return ["quant_model_description.json"]
 
     @classmethod
     def from_config(cls, config: Dict[str, Any]) -> "AscendQuantConfig":