mx31pdk: Change maintainer

Currently I don't have access to a mx31pdk board.

Magnus was the original maintainer of the board and accepted to take back
this role.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Acked-by: Magnus Lilja <lilja.magnus@gmail.com>
Acked-by: Stefano Babic <sbabic@denx.de>
diff --git a/board/freescale/mx31pdk/MAINTAINERS b/board/freescale/mx31pdk/MAINTAINERS
index 2e057db..ec2a320 100644
--- a/board/freescale/mx31pdk/MAINTAINERS
+++ b/board/freescale/mx31pdk/MAINTAINERS
@@ -1,5 +1,5 @@
 MX31PDK BOARD
-M:	Fabio Estevam <fabio.estevam@freescale.com>
+M:	Magnus Lilja <lilja.magnus@gmail.com>
 S:	Maintained
 F:	board/freescale/mx31pdk/
 F:	include/configs/mx31pdk.h