mx28evk: Remove AUART/NAND/SPI variants

To ease maintenance, let's keep only the main mx28evk_defconfig
and remove the other variants that have not been migrated to DM.

Signed-off-by: Fabio Estevam <festevam@denx.de>
Acked-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
4 files changed