Summary:
Move the Wayland output device and output transform calls from DRM backend
to AbstractWaylandOutput. This leaves still some loose ends that need to be
tied up later. On failed commit we want to fall back to last working state
and orientation getter in general needs some more refactoring.

Test Plan: Compiles.

Reviewers: #kwin

Subscribers: kwin

Tags: #kwin

Maniphest Tasks: T11670

Differential Revision: https://phabricator.kde.org/D25504