arm: kirkwood: Add support for ZyXEL NSA325 board

ZyXEL NSA325 specifications:

Marvell Kirkwood 88F6282 SoC
1.6 GHz CPU
1x GBE LAN port (Marvell MV88E1318)
512 MB RAM
128 MB Eon NAND, SLC
I2C
1x USB 3.0 (on PCIe bus)
2x USB 2.0
2x SATA (hot swap slots)
Serial console

Signed-off-by: Tony Dinh <mibodhi@gmail.com>
Reviewed-by: Stefan Roese <sr@denx.de>
diff --git a/arch/arm/mach-kirkwood/Kconfig b/arch/arm/mach-kirkwood/Kconfig
index 54027cc..c2fff84 100644
--- a/arch/arm/mach-kirkwood/Kconfig
+++ b/arch/arm/mach-kirkwood/Kconfig
@@ -133,6 +133,12 @@
 	select KW88F6192
 	select KIRKWOOD_COMMON
 
+config TARGET_NSA325
+	bool "ZyXEL NSA325"
+	select FEROCEON_88FR131
+	select KW88F6281
+	select KIRKWOOD_COMMON
+
 config TARGET_SBx81LIFKW
 	bool "Allied Telesis SBx81GS24/SBx81GT40/SBx81XS6/SBx81XS16"
 	select FEROCEON_88FR131
@@ -177,6 +183,7 @@
 source "board/Seagate/goflexhome/Kconfig"
 source "board/Seagate/nas220/Kconfig"
 source "board/zyxel/nsa310s/Kconfig"
+source "board/zyxel/nsa325/Kconfig"
 source "board/alliedtelesis/SBx81LIFKW/Kconfig"
 source "board/alliedtelesis/SBx81LIFXCAT/Kconfig"