[fx] preserver partiioner order fix (#122111)
Summary:
Previous implementation seems to introduce a key value of {"node": none}. This causes an error in logging later on because we extract the name from the "node" but it is a string instead of a torch.fx.node
This seems to cause tests to pass.
Test Plan:
CI
ExecuTorch CI:
buck test mode/dev-nosan //executorch/backends/xnnpack/test:test_xnnpack_models
Reviewed By: larryliu0820
Differential Revision: D55026133
Pull Request resolved: https://github.com/pytorch/pytorch/pull/122111
Approved by: https://github.com/mikekgfb
