powerpc: fsl: Update maintainers

Update maintainers for B4860QDS, P1010RDB, P1_TWR, T104xRDB.

Signed-off-by: York Sun <york.sun@nxp.com>
diff --git a/board/freescale/p1_twr/MAINTAINERS b/board/freescale/p1_twr/MAINTAINERS
index c19d436..0f9f98f 100644
--- a/board/freescale/p1_twr/MAINTAINERS
+++ b/board/freescale/p1_twr/MAINTAINERS
@@ -1,5 +1,5 @@
 P1_TWR BOARD
-#M:	-
+M:	Xiaobo Xie <xiaobo.xie@nxp.com>
 S:	Maintained
 F:	board/freescale/p1_twr/
 F:	include/configs/p1_twr.h