D23591: [platforms/drm] Disable orientation sensor for now

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REVISION SUMMARY
  The orientation sensor causes a crash when disabling and afterwards enabling
  again the first output in a multi-monitor environment. This is difficult to
  debug, since gdb does not provide good information and with valgrind it does
  not crash indicating that it is a race. But output of gdb and valgrind together
  shows that the orientation sensor is responsible.
  
  For now disable the orientation sensor. Reasons are:
  
  - Output enablement is a basic feature and must work first flawlessly before thinking about advanced features.
  - The orientation sensor did never really work flawlessly according to user feedback.
  - The orientation sensor hooks into Screens class which will go away. A rewrite of the sensor is necessary.

TEST PLAN
  When orientation sensor is disable dthe first output can be disabled and enabled
  again

REPOSITORY
  R108 KWin

BRANCH
  disableOrientationSensorOnDrm

REVISION DETAIL
  https://phabricator.kde.org/D23591

AFFECTED FILES
  plugins/platforms/drm/drm_output.cpp

To: romangg, #kwin
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