exynos_defconfig updates for v4.2

- enable DRM_EXYNOS_DSI and DRM_PANEL_S6E8AA0
  for full X11 display on Trats2 board
- enable SENSORS_PWM_FAN
  to control fan power on Odroid-XU3 board
- enable SENSORS_INA2XX
  for power monitor sensor on Odriod-XU3 board
- do savedefconfig
  to remove useless configs and check its dependencies
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