arm/km: add support for kmsuv31 board

This board is from a u-boot point of view a mixture between kmnusa and
a standard km_kirkwood board. We have our u-boot environment in the spi
NOR flash, but we have a direct connection between the kirkwood and the
piggy. A FPGA is connected via the PCIe interface. So we only have to
select the specific features in the board setup.

Signed-off-by: Holger Brunck <holger.brunck@keymile.com>
cc: Valentin Longchamp <valentin.longchamp@keymile.com>
cc: Prafulla Wadaskar <prafulla@marvell.com>
Acked-By: Prafulla Wadaskar <prafulla@marvell.com>
diff --git a/boards.cfg b/boards.cfg
index 860d8f1..f785da8 100644
--- a/boards.cfg
+++ b/boards.cfg
@@ -163,6 +163,7 @@
 km_kirkwood                  arm         arm926ejs   km_arm              keymile        kirkwood    km_kirkwood:KM_KIRKWOOD
 km_kirkwood_pci              arm         arm926ejs   km_arm              keymile        kirkwood    km_kirkwood:KM_KIRKWOOD_PCI
 kmnusa                       arm         arm926ejs   km_arm              keymile        kirkwood    km_kirkwood:KM_NUSA
+kmsuv31                      arm         arm926ejs   km_arm              keymile        kirkwood    km_kirkwood:KM_SUV31
 mgcoge3un                    arm         arm926ejs   km_arm              keymile        kirkwood    km_kirkwood:KM_MGCOGE3UN
 kmcoge5un                    arm         arm926ejs   km_arm              keymile        kirkwood    km_kirkwood:KM_COGE5UN
 portl2                       arm         arm926ejs   km_arm              keymile        kirkwood    km_kirkwood:KM_PORTL2