BACKLIGHT_CLASS_DEVICE was selected in the last version of the
tinydrm patchset to fix the backlight dependency, but the
ifdef CONFIG_BACKLIGHT_CLASS_DEVICE was forgotten. Fix that.
Signed-off-by: NNoralf Trønnes <noralf@tronnes.org>
Signed-off-by: NDave Airlie <airlied@redhat.com>