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/arch/arm/cpu/armv7/mx6/Kconfig b/arch/arm/cpu/armv7/mx6/Kconfig
index 77fad04..8b0120f 100644
--- a/arch/arm/cpu/armv7/mx6/Kconfig
+++ b/arch/arm/cpu/armv7/mx6/Kconfig
@@ -41,6 +41,10 @@
 	bool "aristainetos2"
 	select CPU_V7
 
+config TARGET_ARISTAINETOS2B
+	bool "Support aristainetos2-revB"
+	select CPU_V7
+
 config TARGET_CGTQMX6EVAL
 	bool "cgtqmx6eval"
 	select CPU_V7