board/km: update MAINTAINERS email

Signed-off-by: Holger Brunck <holger.brunck@hitachi-powergrids.com>
CC: Valentin Longchamp <valentin.longchamp@hitachi-powergrids.com>
diff --git a/board/keymile/km83xx/MAINTAINERS b/board/keymile/km83xx/MAINTAINERS
index 177c2c4..d9483c7 100644
--- a/board/keymile/km83xx/MAINTAINERS
+++ b/board/keymile/km83xx/MAINTAINERS
@@ -1,5 +1,5 @@
 KM83XX BOARD
-M:	Holger Brunck <holger.brunck@ch.abb.com>
+M:	Holger Brunck <holger.brunck@hitachi-powergrids.com>
 S:	Maintained
 F:	board/keymile/km83xx/
 F:	include/configs/km8360.h