MAINTAINERS: update the maintainer of Arndale board

Inderpal's email address is not working any more.
Chander will be a new maintainer.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Cc: Chander Kashyap <k.chander@samsung.com>
Cc: Minkyu Kang <mk7.kang@samsung.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>

board/samsung/arndale/MAINTAINERS

 ARNDALE BOARD
-M:	Inderpal Singh <inderpal.singh@linaro.org>
+M:	Chander Kashyap <k.chander@samsung.com>
 S:	Maintained
 F:	board/samsung/arndale/
 F:	include/configs/arndale.h