board/freescale: Update MAINTAINERS files

Update maintainers for secure boot targets.

Signed-off-by: York Sun <york.sun@nxp.com>
diff --git a/board/freescale/ls1043ardb/MAINTAINERS b/board/freescale/ls1043ardb/MAINTAINERS
index 84ffb63..0503a3f 100644
--- a/board/freescale/ls1043ardb/MAINTAINERS
+++ b/board/freescale/ls1043ardb/MAINTAINERS
@@ -9,6 +9,6 @@
 F:	configs/ls1043ardb_sdcard_defconfig
 
 LS1043A_SECURE_BOOT BOARD
-M:	Aneesh Bansal <aneesh.bansal@freescale.com>
+M:	Ruchika Gupta <ruchika.gupta@nxp.com>
 S:	Maintained
 F:	configs/ls1043ardb_SECURE_BOOT_defconfig