MAINTAINERS: update uhid and hid-wiimote entry

My last name changed to "Rheinsberg", so update the maintainer entries
and adjust the emails while at it.

Signed-off-by: David Rheinsberg <david.rheinsberg@gmail.com>
Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>