[Mobile] Fix The Build For Model Tracer (#84755)
Summary: Currently, the model tracer build is broken because of 2 reasons:
1. A few source files are missing, resulting in missing link time symbols
2. The `TRACING_BASED` flag isn't passed correctly from the command line (specified as an evnironment variable) as a CMake flag
Both these issues were fixed.
Test Plan: Ran this command: `USE_CUDA=0 TRACING_BASED=1 python setup.py develop --cmake`
and saw that the tracer binary was built at `build/bin/model_tracer` - also ran it to ensure that it can generate a YAML file.
Differential Revision: [D39391270](https://our.internmc.facebook.com/intern/diff/D39391270)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/84755
Approved by: https://github.com/cccclai
