ARM: zynq: Remove Jagan from list of maintainers

Email address is not longer valid that's why remove it.
Signed-off-by: NMichal Simek <michal.simek@xilinx.com>

board/xilinx/zynq/MAINTAINERS

 ZYNQ BOARD
 M:	Michal Simek <monstr@monstr.eu>
-M:	Jagannadha Sutradharudu Teki <jaganna@xilinx.com>
 S:	Maintained
 F:	board/xilinx/zynq/
 F:	include/configs/zynq*.h