D25504: Set transform in AbstractWaylandOutput

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REVISION 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.

REPOSITORY
  R108 KWin

BRANCH
  output-device-rotation

REVISION DETAIL
  https://phabricator.kde.org/D25504

AFFECTED FILES
  abstract_wayland_output.cpp
  abstract_wayland_output.h
  plugins/platforms/drm/drm_output.cpp

To: romangg, #kwin
Cc: kwin, LeGast00n, The-Feren-OS-Dev, sbergeron, jraleigh, fbampaloukas, GB_2, mkulinski, ragreen, jackyalcine, iodelay, crozbo, bwowk, ZrenBot, ngraham, alexeymin, himcesjf, lesliezhai, ali-mohamed, hardening, romangg, jensreuterberg, abetts, sebas, apol, ahiemstra, mart