board: m68k add missing maintainer

Add myself as a maintainer for orphaned boards.
All these boards are covered by buildman m68k test.

Signed-off-by: Angelo Dureghello <angelo@kernel-space.org>
diff --git a/board/cobra5272/MAINTAINERS b/board/cobra5272/MAINTAINERS
index a064da2..1f398a7 100644
--- a/board/cobra5272/MAINTAINERS
+++ b/board/cobra5272/MAINTAINERS
@@ -1,5 +1,5 @@
 COBRA5272 BOARD
-#M:	-
+M:      Angelo Dureghello <angelo@kernel-space.org>
 S:	Maintained
 F:	board/cobra5272/
 F:	include/configs/cobra5272.h