imx6: aristainetos: readd aristainetos 2b board

readd aristainetos 2b board.

Signed-off-by: Heiko Schocher <hs@denx.de>
diff --git a/board/aristainetos/Kconfig b/board/aristainetos/Kconfig
index 6700f51..2e1d84d 100644
--- a/board/aristainetos/Kconfig
+++ b/board/aristainetos/Kconfig
@@ -9,3 +9,15 @@
 	default 2
 
 endif
+
+if TARGET_ARISTAINETOS2B
+
+source "board/aristainetos/common/Kconfig"
+
+config SYS_BOARD
+	default "aristainetos"
+
+config SYS_BOARD_VERSION
+	default 3
+
+endif