[xnnpack][lite-int] Freeze/Inline module to remove reference to self (#88863)
We need to inline graph before converting from torchscript to xnnpack flatubuffer. Remove graph dependence on self.
This will later help us work with constant data.
Differential Revision: [D41049858](https://our.internmc.facebook.com/intern/diff/D41049858/)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/88863
Approved by: https://github.com/digantdesai
