D25507: Set orientation from DRM on fallback

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REVISION SUMMARY
  In case of a failed atomic commit the previous mode should be fallen back to.
  For orientation provide again a setter that DRM backend can use to set the
  transform back to the last working one.

TEST PLAN
  Compiles

REPOSITORY
  R108 KWin

BRANCH
  output-fallback-orientation

REVISION DETAIL
  https://phabricator.kde.org/D25507

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