MAINTAINERS: mmc: Remove Seungwon Jeon from dw_mmc

Unfortunate, Seungwon's email has been bouncing for some time and it seems
like he has moved on to other duties. So, I would like to thank him for
his efforts, but it's now time to remove him as the co-maintainer for the
dw_mmc driver.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Jaehoon Chung <jh80.chung@samsung.com>

MAINTAINERS

@@ -9290,7 +9290,6 @@ F:	drivers/i2c/busses/i2c-designware-*
 F:	include/linux/platform_data/i2c-designware.h
 
 SYNOPSYS DESIGNWARE MMC/SD/SDIO DRIVER
-M:	Seungwon Jeon <tgih.jun@samsung.com>
 M:	Jaehoon Chung <jh80.chung@samsung.com>
 L:	linux-mmc@vger.kernel.org
 S:	Maintained