Init _no_split_modules to empty list to allow device_map=auto

modeling_florence2.py

@@ -2530,6 +2530,8 @@ class Florence2VisionModelWithProjection(Florence2PreTrainedModel):
     FLORENCE2_START_DOCSTRING,
 )
 class Florence2ForConditionalGeneration(Florence2PreTrainedModel):
+    _no_split_modules = []
+    
     def __init__(self, config: Florence2Config):
         super().__init__(config)
         assert config.vision_config.model_type == 'davit', 'only DaViT is supported for now'