Add serial number and EISA ID to OutputDevice interface
Reviewers: graesslin, sebas, KWin, dvratil, romangg
Reviewed By: KWin, romangg
Subscribers: romangg, kde-frameworks-devel, davidedmundson, plasma-devel
Tags: Plasma on Wayland, Frameworks
Differential Revision: https://phabricator.kde.org/D10040