drm/panel/lg-sw43408: select CONFIG_DRM_DISPLAY_DP_HELPER

This panel driver uses DSC PPS functions and as such depends on the
DRM_DISPLAY_DP_HELPER. Select this symbol to make required functions
available to the driver.

Reported-by: kernel test robot <[email protected]>
Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/
Fixes: 069a6c0 ("drm: panel: Add LG sw43408 panel driver")
Reviewed-by: Neil Armstrong <[email protected]>
Reviewed-by: Marijn Suijten <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Signed-off-by: Dmitry Baryshkov <[email protected]>

Author: lumag

drivers/gpu/drm/panel/Kconfig

@@ -340,6 +340,8 @@ config DRM_PANEL_LG_SW43408
 	depends on OF
 	depends on DRM_MIPI_DSI
 	depends on BACKLIGHT_CLASS_DEVICE
+	select DRM_DISPLAY_DP_HELPER
+	select DRM_DISPLAY_HELPER
 	help
 	  Say Y here if you want to enable support for LG sw43408 panel.
 	  The panel has a 1080x2160@60Hz resolution and uses 24 bit RGB per