The support to update U-Boot in the redundant partition must be enabled in the project
configuration file by setting the variable "SWUPDATE_UBOOTIMG_REDUNDANT" to "true":
SWUPDATE_UBOOTIMG_REDUNDANT = "true"
This feature is only available for the newer platforms: ccmp13, ccmp15 and ccimx93. Trying to
enable it in older platforms will display a warning and fallback to non-redundant update.
Signed-off-by: David Escalona <david.escalona@digi.com>