arm/km: add support for SUSE2

This board is similar to SUV31, but the FPGA is reset concept is quite
different.

Signed-off-by: Holger Brunck <holger.brunck@ch.abb.com>
CC: Valentin Longchamp <valentin.longchamp@ch.abb.com>
CC: Stefan Roese <sr@denx.de>
Reviewed-by: Stefan Roese <sr@denx.de>