colibri-imx6ull: add emmc variant

Add code to build the eMMC variant of the Colibri iMX6ULL, i.e. the
'Colibri iMX6ULL 1GB' which has a eMMC instead of the raw NAND used
on other SKUs.

Related-to: ELB-4056, ELB-4057
Signed-off-by: Max Krummenacher <max.krummenacher@toradex.com>
Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
diff --git a/configs/colibri-imx6ull_defconfig b/configs/colibri-imx6ull_defconfig
index 0af56f4..e2f168b 100644
--- a/configs/colibri-imx6ull_defconfig
+++ b/configs/colibri-imx6ull_defconfig
@@ -10,6 +10,7 @@
 CONFIG_TARGET_COLIBRI_IMX6ULL=y
 CONFIG_SYS_MALLOC_LEN=0x2000000
 CONFIG_DM_GPIO=y
+CONFIG_TARGET_COLIBRI_IMX6ULL_NAND=y
 CONFIG_DEFAULT_DEVICE_TREE="imx6ull-colibri"
 CONFIG_DISTRO_DEFAULTS=y
 CONFIG_FIT=y
@@ -71,7 +72,6 @@
 CONFIG_DM_MTD=y
 CONFIG_MTD_RAW_NAND=y
 CONFIG_SYS_NAND_USE_FLASH_BBT=y
-CONFIG_NAND_MXS=y
 CONFIG_NAND_MXS_DT=y
 CONFIG_SYS_NAND_ONFI_DETECTION=y
 CONFIG_MTD_UBI_FASTMAP=y