[Bugfix] Fix Granite 3.0 MoE model loading (#12446)

Signed-off-by: DarkLight1337 <[email protected]>

Author: DarkLight1337

vllm/model_executor/models/granitemoe.py

@@ -348,6 +348,7 @@ def __init__(self, *, vllm_config: VllmConfig, prefix: str = ""):
 
         self.config = config
         self.lora_config = lora_config
+        self.quant_config = quant_config  # Required by MixtralForCausalLM
 
         self.model = GraniteMoeModel(vllm_config=vllm_config,
                                      prefix=maybe_prefix(prefix, "model"))