imx6, aristaintetos2: add me as maintainer

Add me as Maintainer for the aristainetos2b board.

Signed-off-by: Heiko Schocher <hs@denx.de>

board/aristainetos/MAINTAINERS

@@ -6,3 +6,4 @@ F:	include/configs/aristainetos.h
 F:	configs/aristainetos_defconfig
 F:	include/configs/aristainetos2.h
 F:	configs/aristainetos2_defconfig
+F:	configs/aristainetos2b_defconfig