[energy kcm] Display Vendor and model
The code is not great, I would be open to have a suggestion to improve it.
I tried to pass Solid::Device directly to the qml side and using QHash to store vendor and product but they are not QObject so it can't work.
Reviewers: broulik, ngraham
Reviewed By: ngraham
Differential Revision: https://phabricator.kde.org/D23152