D19663: [platforms/fbdev] Use a better way to correct activating framebuffer devices

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REVISION SUMMARY
  My change in 304528e80b935efea05e2d5e3030266e0eddc44c <https://phabricator.kde.org/R108:304528e80b935efea05e2d5e3030266e0eddc44c> has been reported to
  cause issues for PostMarketOS https://gitlab.com/postmarketOS/pmaports/issues/204
  I originally submitted the change to activate Framebuffer devices
  as secondary framebuffer devices are not on by default, (such as a
  secondary DisplayLink device). Changing attributes usually forced
  some framebuffer devices to turn on, however I have found a more
  accurate way to turn on framebuffer devices, without messing with
  the color layout.

REPOSITORY
  R108 KWin

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D19663

AFFECTED FILES
  plugins/platforms/fbdev/fb_backend.cpp

To: nerdopolist
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