ARM: imx6: Update dhelectronics/dh_imx6/MAINTAINERS file

Adding new DH electronics mailing list and update list of maintainers.

Signed-off-by: Christoph Niedermaier <cniedermaier@dh-electronics.com>
diff --git a/board/dhelectronics/dh_imx6/MAINTAINERS b/board/dhelectronics/dh_imx6/MAINTAINERS
index ab4e16b..8f9b5ff 100644
--- a/board/dhelectronics/dh_imx6/MAINTAINERS
+++ b/board/dhelectronics/dh_imx6/MAINTAINERS
@@ -1,6 +1,7 @@
 DH_IMX6 BOARD
 M:	Andreas Geisreiter <ageisreiter@dh-electronics.de>
-M:	Ludwig Zenz <lzenz@dh-electronics.de>
+M:	Christoph Niedermaier <cniedermaier@dh-electronics.com>
+L:	u-boot@dh-electronics.com
 S:	Maintained
 F:	board/dhelectronics/dh_imx6/
 F:	include/configs/dh_imx6.h