mx7dsabresd: Add myself as maintainer

I would like to help co-maintaining this board.

Signed-off-by: Fabio Estevam <festevam@gmail.com>
diff --git a/board/freescale/mx7dsabresd/MAINTAINERS b/board/freescale/mx7dsabresd/MAINTAINERS
index 5f805af..721321c 100644
--- a/board/freescale/mx7dsabresd/MAINTAINERS
+++ b/board/freescale/mx7dsabresd/MAINTAINERS
@@ -1,5 +1,6 @@
 MX7DSABRESD BOARD
 M:	Adrian Alonso <adrian.alonso@nxp.com>
+M:	Fabio Estevam <festevam@gmail.com>
 S:	Maintained
 F:	board/freescale/mx7dsabresd
 F:	include/configs/mx7dsabresd.h