MoveVllmConfig from config/__init__.py to config/vllm.py (#25271)

Signed-off-by: Harry Mellor <19981378+hmellor@users.noreply.github.com>

vllm/model_executor/layers/quantization/gptq_marlin_24.py

@@ -9,9 +9,8 @@ from torch.nn.parameter import Parameter
 from vllm import _custom_ops as ops
 from vllm.logger import init_logger
 from vllm.model_executor.layers.linear import LinearBase, LinearMethodBase
-from vllm.model_executor.layers.quantization import QuantizationMethods
-from vllm.model_executor.layers.quantization.base_config import (
-    QuantizationConfig)
+from vllm.model_executor.layers.quantization import (QuantizationConfig,
+                                                     QuantizationMethods)
 from vllm.model_executor.parameter import (BasevLLMParameter,
                                            ChannelQuantScaleParameter,
                                            GroupQuantScaleParameter,