[Cleanup] Only log MoE DP setup warning if DP is enabled (#21315)

Signed-off-by: mgoin <mgoin64@gmail.com>

vllm/model_executor/layers/fused_moe/config.py

@@ -464,6 +464,7 @@ class FusedMoEConfig:
                 )
             else:
                 _quant_config = FusedMoEQuantConfig()
+                if moe_parallel_config.dp_size > 1:
                     logger.warning_once("MoE DP setup unable to determine "
                                         "quantization scheme or unsupported "
                                         "quantization type. This model will "