powerpc: mpc85xx: Update maintainer for MPC8541CDS and MPC8555CDS

Signed-off-by: York Sun <york.sun@nxp.com>

board/freescale/mpc8541cds/MAINTAINERS

@@ -1,6 +1,6 @@
 MPC8541CDS BOARD
-#M:	Kumar Gala <kumar.gala@freescale.com>
-S:	Orphan (since 2014-06)
+M:	York Sun <york.sun@nxp.com>
+S:	Maintained
 F:	board/freescale/mpc8541cds/
 F:	include/configs/MPC8541CDS.h
 F:	configs/MPC8541CDS_defconfig

board/freescale/mpc8555cds/MAINTAINERS

@@ -1,6 +1,6 @@
 MPC8555CDS BOARD
-#M:	Kumar Gala <kumar.gala@freescale.com>
-S:	Orphan (since 2014-06)
+M:	York Sun <york.sun@nxp.com>
+S:	Maintained
 F:	board/freescale/mpc8555cds/
 F:	include/configs/MPC8555CDS.h
 F:	configs/MPC8555CDS_defconfig