Forward fix eval_llama_qnn

[cccclai]

#15807 break the eval flow. Forward fix

[pytorch-bot]

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[DannyYuyang-quic]

Sorry for the late catch. I just saw this PR.
And it actually needs to be called like this:

custom_annotations = decoder_model_config.quant_recipe().recipe.custom_quant_annotations

[cccclai]

Fixed in a different PR