arm, imx6: add aristainetos 2b board version

there is a 2b board version of the aristainetos2
board. Differences to the v2:

- spi cs for the nor flash and display controller
  changed
- some pinmux changes
- LED gpio settings changed

Signed-off-by: Heiko Schocher <hs@denx.de>
diff --git a/board/aristainetos/Kconfig b/board/aristainetos/Kconfig
index 500b665..e987f38 100644
--- a/board/aristainetos/Kconfig
+++ b/board/aristainetos/Kconfig
@@ -23,3 +23,16 @@
 	default "aristainetos2"
 
 endif
+
+if TARGET_ARISTAINETOS2B
+
+config SYS_BOARD
+	default "aristainetos"
+
+config SYS_SOC
+	default "mx6"
+
+config SYS_CONFIG_NAME
+	default "aristainetos2b"
+
+endif