MAINTAINERS: mmc: Update email for host driver maintainer

Update Ian Molton's email, the maintainer for tmio/sh_mobile_sdhci.

Cc: Ian Molton <ian.molton@codethink.co.uk>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Ian Molton <ian.molton@codethink.co.uk>
Signed-off-by: Chris Ball <chris@printf.net>

MAINTAINERS

@@ -9000,7 +9000,7 @@ F:	include/linux/toshiba.h
 F:	include/uapi/linux/toshiba.h
 
 TMIO MMC DRIVER
-M:	Ian Molton <ian@mnementh.co.uk>
+M:	Ian Molton <ian.molton@codethink.co.uk>
 L:	linux-mmc@vger.kernel.org
 S:	Maintained
 F:	drivers/mmc/host/tmio_mmc*