ARM: mx5: add support for USB armory board

Add support for Inverse Path USB armory board, an open source
flash-drive sized computer based on Freescale i.MX53 SoC.

http://inversepath.com/usbarmory

Signed-off-by: Andrej Rosano <andrej@inversepath.com>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Chris Kuethe <chris.kuethe@gmail.com>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: Vagrant Cascadian <vagrant@debian.org>
Tested-By: Vagrant Cascadian <vagrant@debian.org>
Tested-by: Chris Kuethe <chris.kuethe@gmail.com>
diff --git a/arch/arm/cpu/armv7/mx5/Kconfig b/arch/arm/cpu/armv7/mx5/Kconfig
index 960a718..2d6c0ce 100644
--- a/arch/arm/cpu/armv7/mx5/Kconfig
+++ b/arch/arm/cpu/armv7/mx5/Kconfig
@@ -10,7 +10,18 @@
 config MX53
 	bool
 
+choice
+	prompt "MX5 board select"
+
+config TARGET_USBARMORY
+	bool "Support USB armory"
+	select CPU_V7
+
+endchoice
+
 config SYS_SOC
 	default "mx5"
 
+source "board/inversepath/usbarmory/Kconfig"
+
 endif