mx51evk: Add myself as maintainer

I would like to help supporting this board, so add myself
as a maintainer.

Signed-off-by: Fabio Estevam <festevam@gmail.com>
diff --git a/board/freescale/mx51evk/MAINTAINERS b/board/freescale/mx51evk/MAINTAINERS
index 0e5f22c..1ca55f7 100644
--- a/board/freescale/mx51evk/MAINTAINERS
+++ b/board/freescale/mx51evk/MAINTAINERS
@@ -1,4 +1,5 @@
 MX51EVK BOARD
+M:	Fabio Estevam <festevam@gmail.com>
 M:	Stefano Babic <sbabic@denx.de>
 S:	Maintained
 F:	board/freescale/mx51evk/