imx6: aristainetos: add aristainetos 2b csl

add aristainetso board version CSL.

Signed-off-by: Heiko Schocher <hs@denx.de>
diff --git a/board/aristainetos/common/Kconfig b/board/aristainetos/common/Kconfig
index a15993e..6f1c825 100644
--- a/board/aristainetos/common/Kconfig
+++ b/board/aristainetos/common/Kconfig
@@ -4,6 +4,7 @@
 	  version of aristainetos board version
 	  2 version 2
 	  3 version 2b
+	  4 version 2bcsl
 
 config SYS_I2C_MXC_I2C1
 	default y