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/configs/mx6ul_9x9_evk_defconfig b/configs/mx6ul_9x9_evk_defconfig
index b9fb2ec..81f9b5b 100644
--- a/configs/mx6ul_9x9_evk_defconfig
+++ b/configs/mx6ul_9x9_evk_defconfig
@@ -70,4 +70,4 @@
 CONFIG_USB=y
 CONFIG_DM_USB=y
 CONFIG_USB_STORAGE=y
-CONFIG_VIDEO=y
+CONFIG_DM_VIDEO=y