MAINTAINERS: update OMAP MMC entry

MAINTAINERS: update OMAP MMC entry

Jarkko's e-mail address hasn't worked for a long time.  We still want to
keep this driver working as it is critical for some of the OMAP boards.
I use and test this driver frequently, so change myself as a maintainer
with "Odd Fixes" status.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Aaro Koskinen <[email protected]>
Acked-by: Tony Lindgren <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>