Hardcoded paths in some files

[pcotret]

There are 2 files with hardcoded paths:

• https://github.com/QDucasse/nn_benchmark/blob/fa8499bfb16dc60ce5b3cc9f0687961451f35af2/finn_experiments/utilization_extractor.py#L20
• https://github.com/QDucasse/nn_benchmark/blob/fa8499bfb16dc60ce5b3cc9f0687961451f35af2/finn_experiments/plot_accuracy.py#L5

Remark:

• It may be difficult to include precomputed files (too big ?). If it's too complicated, leave as it is.