dm: arm: imx: cx9020: migrate to dm_video

Enable DM_VIDEO in config and don't overwrite console so it can be set
from environment

Acked-by: Patrick Bruenn <p.bruenn@beckhoff.com>
Signed-off-by: Steffen Dirkwinkel <s.dirkwinkel@beckhoff.com>
diff --git a/configs/mx53cx9020_defconfig b/configs/mx53cx9020_defconfig
index 4f49fd2..b809066 100644
--- a/configs/mx53cx9020_defconfig
+++ b/configs/mx53cx9020_defconfig
@@ -33,6 +33,5 @@
 CONFIG_PINCTRL=y
 CONFIG_PINCTRL_IMX5=y
 CONFIG_MXC_UART=y
+CONFIG_DM_VIDEO=y
 CONFIG_VIDEO_IPUV3=y
-CONFIG_VIDEO=y
-# CONFIG_VIDEO_SW_CURSOR is not set