network: DSENT power model

This patch removes Orion 2.0 and adds the DSENT to the garnet network as the new NoC power/area model.
The power model reads configurations from python scripts and GARNET, and generates power estimation
for NoC based on the performance stats provided by GARNET. DSENT assumes tile-based multicore design
to calculate link length (see topology scripts). Users can specify the clock frequency and various
electrical technology node from python scripts.