imx: mx6ul_14x14_evk: convert to DM_VIDEO

To support DM_VIDEO,
 Add display node for lcdif
 Drop board iomuxc settings.
 Enable DM_VIDEO

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Anatolij Gustschin <agust@denx.de>
diff --git a/include/configs/mx6ul_14x14_evk.h b/include/configs/mx6ul_14x14_evk.h
index 42e5115..f8a5fd3 100644
--- a/include/configs/mx6ul_14x14_evk.h
+++ b/include/configs/mx6ul_14x14_evk.h
@@ -196,7 +196,7 @@
 #define CONFIG_IMX_THERMAL
 
 #ifndef CONFIG_SPL_BUILD
-#ifdef CONFIG_VIDEO
+#if defined(CONFIG_DM_VIDEO)
 #define CONFIG_VIDEO_MXS
 #define CONFIG_VIDEO_LOGO
 #define CONFIG_SPLASH_SCREEN