Correcting the installation of the ethos-u-vela library

[djairjr]

Correcting the installation of the ethos-u-vela library that is not being done correctly via pip in the installation script.

The ethos-u-vela library was not being installed via pip due to some inconsistency in the metadata. Tested only on Google Colab.

At the beginning of the Notebook add the commands:

# Ethos-U-Vela need to be installed this way, or SSCMA does not work anymore...
!git clone https://review.mlplatform.org/ml/ethos-u/ethos-u-vela.git
%cd ethos-u-vela
!pip install .
%cd..