drm: panel: simple-panel: add bus format information for foxlink panel

Foxlink's fl500wvr00-a0t supports RGB888 format.
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>
Acked-by: NThierry Reding <treding@nvidia.com>

drivers/gpu/drm/panel/panel-simple.c

@@ -563,6 +563,7 @@ static const struct panel_desc foxlink_fl500wvr00_a0t = {
 		.width = 108,
 		.height = 65,
 	},
+	.bus_format = MEDIA_BUS_FMT_RGB888_1X24,
 };
 
 static const struct drm_display_mode hannstar_hsd070pww1_mode = {