FIT: rename default target
NetCON3: update defconfig

Remove iw, ser2net and can-utils.
Rework U-Boot support for Balios

Change MTD partitioning: remove /dev/mtd6 and let the user partition
/dev/mtd5 via UBI layer.

Add per SystemID device support.
NetCON3: uEnv.txt use FIT config based on the model