fix: jamba cache fails to use torch.nn.module

[xgal]

Fixes # 32853

What does this PR do?

Fix for issue: #32853
AttributeError: 'HybridMambaAttentionDynamicCache' object has no attribute '_modules'

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[amyeroberts]

cc @ArthurZucker @gante

[ArthurZucker]

Thanks for the prompt fix