ARM: add SBx81LIFKW board

This is a series of line cards for Allied Telesis's SBx8100 chassis
switch. The CPU block is common to the SBx81GS24a, SBx81XS6, SBx81XS16
and SBx81GT40 cards collectively referred to as SBx81LIFKW in u-boot.

Reviewed-by: Stefan Roese <sr@denx.de>
Signed-off-by: Chris Packham <judge.packham@gmail.com>
Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/arch/arm/mach-kirkwood/Kconfig b/arch/arm/mach-kirkwood/Kconfig
index 2dd107a..5a5a63c 100644
--- a/arch/arm/mach-kirkwood/Kconfig
+++ b/arch/arm/mach-kirkwood/Kconfig
@@ -59,6 +59,9 @@
 config TARGET_NSA310S
 	bool "Zyxel NSA310S"
 
+config TARGET_SBx81LIFKW
+	bool "Allied Telesis SBx81GS24/SBx81GT40/SBx81XS6/SBx81XS16"
+
 endchoice
 
 config SYS_SOC
@@ -81,5 +84,6 @@
 source "board/Seagate/goflexhome/Kconfig"
 source "board/Seagate/nas220/Kconfig"
 source "board/zyxel/nsa310s/Kconfig"
+source "board/alliedtelesis/SBx81LIFKW/Kconfig"
 
 endif