D25830: [platforms/drm] Do EglGbmBackend chore

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REVISION SUMMARY
  This is a small overhaul of the EglGbmBackend. Functions are restructured,
  white space added and variables renamed for better readability and style
  aligned with Frameworks Coding Style.

TEST PLAN
  Session starts.

REPOSITORY
  R108 KWin

BRANCH
  eglgbm-fixup

REVISION DETAIL
  https://phabricator.kde.org/D25830

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

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