[Bugfix] Fix _get_lora_device for HQQ marlin (#12090)

Signed-off-by: Varun Sundar Rabindranath <varun@neuralmagic.com>
Co-authored-by: Varun Sundar Rabindranath <varun@neuralmagic.com>

vllm/lora/layers.py

@@ -51,6 +51,9 @@ def _get_lora_device(base_layer: nn.Module) -> torch.device:
     # marlin
     elif hasattr(base_layer, "B"):
         return base_layer.B.device
+    # HQQ marlin
+    elif hasattr(base_layer, "W_q"):
+        return base_layer.W_q.device
     else:
         raise ValueError(f"Unsupported base layer: {base_layer}")