D25906: [platforms/drm] Add hardware transformation API

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REVISION SUMMARY
  Planes might be able to do transformations without compositing required.
  When changing the current transform try this with the primary plane. If this
  fails fall back to no transformation at all through hardware and communicate
  the fact and other information through some getters.

TEST PLAN
  Compiles.

REPOSITORY
  R108 KWin

BRANCH
  hardware-rotation-api

REVISION DETAIL
  https://phabricator.kde.org/D25906

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

To: romangg, #kwin
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