drm/panel: fix Visionox RM692E5 dependencies

drm/panel: fix Visionox RM692E5 dependencies

The newly added driver uses the DSC helpers, so the corresponding
Kconfig option must be enabled:

ERROR: modpost: "drm_dsc_pps_payload_pack" [drivers/gpu/drm/panel/panel-visionox-rm692e5.ko] undefined!

Fixes: 7cb3274341bf ("drm/panel: Add Visionox RM692E5 panel driver")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20250304142907.732196-1-arnd@kernel.org
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>