Update aristainetos board to Kconfig

aristainetos board was merged in u-boot-imx before
Kconfig was integrated, but it is not yet
mainline.

Signed-off-by: Stefano Babic <sbabic@denx.de>
CC: Heiko Schocher <hs@denx.de>
Acked-by: Heiko Schocher <hs@denx.de>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index e385eda..63f8576 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -512,6 +512,9 @@
 config TARGET_EMBESTMX6BOARDS
 	bool "Support embestmx6boards"
 
+config TARGET_ARISTAINETOS
+	bool "Support aristainetos"
+
 config TARGET_MX6QARM2
 	bool "Support mx6qarm2"
 
@@ -773,6 +776,7 @@
 endchoice
 
 source "board/8dtech/eco5pk/Kconfig"
+source "board/aristainetos/Kconfig"
 source "board/Barix/ipam390/Kconfig"
 source "board/BuR/kwb/Kconfig"
 source "board/BuR/tseries/Kconfig"