add _repeated_blocks for ErnieImageTransformer2DModel (huggingface#13496)

Signed-off-by: Liu, Kaixuan <kaixuan.liu@intel.com>
Co-authored-by: dg845 <58458699+dg845@users.noreply.github.com>

Author: kaixuanliu

src/diffusers/models/transformers/transformer_ernie_image.py

@@ -290,6 +290,7 @@ def forward(self, x: torch.Tensor, conditioning: torch.Tensor) -> torch.Tensor:
 
 class ErnieImageTransformer2DModel(ModelMixin, ConfigMixin):
     _supports_gradient_checkpointing = True
+    _repeated_blocks = ["ErnieImageSharedAdaLNBlock"]
 
     @register_to_config
     def __init__(