Add Learned PE selection for Auraflow (#9182)
* add pe
* Update src/diffusers/models/transformers/auraflow_transformer_2d.py
Co-authored-by: Sayak Paul <spsayakpaul@gmail.com>
* Update src/diffusers/models/transformers/auraflow_transformer_2d.py
* beauty
* retrigger ci.
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Co-authored-by: Sayak Paul <spsayakpaul@gmail.com>
