ipynb: energy_model: add example for energy model analysis

Created by: Leo-Yan

Add ipynb script to analyse energy model and display the power efficiency and capacity between two clusters.

This will be helpful to check if energy model is reasonable or not, and it's straightforward to get to know if there have overlap between two cluster's energy model; If have overlap, which it's likely to introduce wrong behavior for EAS energy calculation.

Signed-off-by: Leo Yan leo.yan@linaro.org