mcx: update maintainer and convert to generic board

Remove obsolete email address from MAINTAINERS.

Signed-off-by: Anatolij Gustschin <agust@denx.de>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Tom Rini <trini@konsulko.com>
diff --git a/board/htkw/mcx/MAINTAINERS b/board/htkw/mcx/MAINTAINERS
index c5f8873..513d19d 100644
--- a/board/htkw/mcx/MAINTAINERS
+++ b/board/htkw/mcx/MAINTAINERS
@@ -1,5 +1,5 @@
 MCX BOARD
-M:	Ilya Yanok <yanok@emcraft.com>
+M:	Anatolij Gustschin <agust@denx.de>
 S:	Maintained
 F:	board/htkw/mcx/
 F:	include/configs/mcx.h