drm/panel: visionox-rm69299: Depend on BACKLIGHT_CLASS_DEVICE

drm/panel: visionox-rm69299: Depend on BACKLIGHT_CLASS_DEVICE

We handle backlight so need that dependency.

Fixes: 7911d8cab554 ("drm/panel: visionox-rm69299: Add backlight support")
Reported-by: kernelci.org bot <bot@kernelci.org>
Signed-off-by: Guido Günther <agx@sigxcpu.org>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Reviewed-by: David Heidelberg <david@ixit.cz>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patch.msgid.link/20251017-visionox-rm69299-bl-v2-1-9dfa06606754@sigxcpu.org