powerpc: mpc8544ds: Update maintainer

Signed-off-by: York Sun <york.sun@nxp.com>
diff --git a/board/freescale/mpc8544ds/MAINTAINERS b/board/freescale/mpc8544ds/MAINTAINERS
index 328be7f..3c6f80e 100644
--- a/board/freescale/mpc8544ds/MAINTAINERS
+++ b/board/freescale/mpc8544ds/MAINTAINERS
@@ -1,5 +1,5 @@
 MPC8544DS BOARD
-#M:	-
+M:	York Sun <york.sun@nxp.com>
 S:	Maintained
 F:	board/freescale/mpc8544ds/
 F:	include/configs/MPC8544DS.h