drm/bridge: ptn3460: support drm_panel

Add drm_panel calls to the driver to make the panel and
bridge work together in tandem.

Signed-off-by: Ajay Kumar <ajaykumar.rs@samsung.com>
Acked-by: Inki Dae <inki.dae@samsung.com>
Tested-by: Rahul Sharma <rahul.sharma@samsung.com>
Tested-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Tested-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
Tested-by: Sjoerd Simons <sjoerd.simons@collabora.co.uk>
Signed-off-by: Thierry Reding <treding@nvidia.com>

drivers/gpu/drm/bridge/Kconfig

@@ -8,5 +8,6 @@ config DRM_PTN3460
 	depends on DRM
 	depends on OF
 	select DRM_KMS_HELPER
+	select DRM_PANEL
 	---help---
 	  ptn3460 eDP-LVDS bridge chip driver.