powerpc/83xx: add support for kmtepr2 board

This board is similar to TUXX1, but it has differend FPGAs.

Signed-off-by: Christoph Dietrich <christoph.dietrich@keymile.com>
Signed-off-by: Andreas Huber <andreas.huber@keymile.com>
Signed-off-by: Valentin Longchamp <valentin.longchamp@keymile.com>