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/b4860qds/MAINTAINERS b/board/freescale/b4860qds/MAINTAINERS
index ac02bb7..97304c5 100644
--- a/board/freescale/b4860qds/MAINTAINERS
+++ b/board/freescale/b4860qds/MAINTAINERS
@@ -12,6 +12,6 @@
 F:	configs/B4860QDS_SRIO_PCIE_BOOT_defconfig
 
 B4860QDS_SECURE_BOOT BOARD
-M:	Aneesh Bansal <aneesh.bansal@freescale.com>
+M:	Ruchika Gupta <ruchika.gupta@nxp.com>
 S:	Maintained
 F:	configs/B4860QDS_SECURE_BOOT_defconfig