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/freescale/m5272c3/MAINTAINERS b/board/freescale/m5272c3/MAINTAINERS
index e586630..692ab5b 100644
--- a/board/freescale/m5272c3/MAINTAINERS
+++ b/board/freescale/m5272c3/MAINTAINERS
@@ -1,5 +1,5 @@
 M5272C3 BOARD
-#M:	-
+M:      Angelo Dureghello <angelo@kernel-space.org>
 S:	Maintained
 F:	board/freescale/m5272c3/
 F:	include/configs/M5272C3.h