drm/panel: visionox-rm69299: Depend on BACKLIGHT_CLASS_DEVICE

We handle backlight so need that dependency.

Fixes: 7911d8c ("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

Author: agx

drivers/gpu/drm/panel/Kconfig

@@ -1165,6 +1165,7 @@ config DRM_PANEL_VISIONOX_RM69299
 	tristate "Visionox RM69299"
 	depends on OF
 	depends on DRM_MIPI_DSI
+	depends on BACKLIGHT_CLASS_DEVICE
 	help
 	  Say Y here if you want to enable support for Visionox
 	  RM69299  DSI Video Mode panel.