Change bcmring Maintainer list.

I am Jiandong Zheng working on BCMRING in Broadcom Canada Ltd. I am
replacing Leo Chen (leochen@broadcom.com) as "ARM/BCMRING ARM
ARCHITECTURE" and "ARM/BCMRING MTD NAND DRIVER" maintainer from
Broadcom as he is no longer the maintainer of these components.
Signed-off-by: Jiandong Zheng <jdzheng@broadcom.com>
Acked-by: Scott Branden <sbranden@broadcom.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

MAINTAINERS

@@ -559,14 +559,14 @@ W:	http://maxim.org.za/at91_26.html
 S:	Maintained
 
 ARM/BCMRING ARM ARCHITECTURE
-M:	Leo Chen <leochen@broadcom.com>
+M:	Jiandong Zheng <jdzheng@broadcom.com>
 M:	Scott Branden <sbranden@broadcom.com>
 L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
 S:	Maintained
 F:	arch/arm/mach-bcmring
 
 ARM/BCMRING MTD NAND DRIVER
-M:	Leo Chen <leochen@broadcom.com>
+M:	Jiandong Zheng <jdzheng@broadcom.com>
 M:	Scott Branden <sbranden@broadcom.com>
 L:	linux-mtd@lists.infradead.org
 S:	Maintained