configs: colibri-imx6ull: switch to DM_VIDEO

Use CONFIG_DM_VIDEO=y by default for Colibri iMX6ULL.
Signed-off-by: NIgor Opaniuk <igor.opaniuk@toradex.com>
Reviewed-by: NOleksandr Suvorov <oleksandr.suvorov@toradex.com>

configs/colibri-imx6ull_defconfig

@@ -78,6 +78,6 @@ CONFIG_USB_GADGET_VENDOR_NUM=0x1b67
 CONFIG_USB_GADGET_PRODUCT_NUM=0x4000
 CONFIG_CI_UDC=y
 CONFIG_USB_GADGET_DOWNLOAD=y
-CONFIG_VIDEO=y
+CONFIG_DM_VIDEO=y
 CONFIG_OF_LIBFDT_OVERLAY=y
 CONFIG_FDT_FIXUP_PARTITIONS=y