Used ccimx6ul_defconfig from v4.1/master repository.
The defconfig file will live under module folder and not specific platform
folder because it will be the same for other ccimx6ul platforms.
https://jira.digi.com/browse/DEL-2381https://jira.digi.com/browse/DEL-2529
Signed-off-by: Isaac Hermida <isaac.hermida@digi.com>