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/common/qrio.h b/board/keymile/common/qrio.h
index a6cfd81..a04a732 100644
--- a/board/keymile/common/qrio.h
+++ b/board/keymile/common/qrio.h
@@ -1,7 +1,7 @@
 /* SPDX-License-Identifier: GPL-2.0+ */
 /*
  * (C) Copyright 2018 ABB
- * Valentin Longchamp <valentin.longchamp@ch.abb.com>
+ * Valentin Longchamp <valentin.longchamp@hitachi-powergrids.com>
  */
 
 #ifndef __QRIO_H