Add entry for arcnet to MAINTAINERS file and add myself as the
maintainer of the subsystem.
Signed-off-by: NMichael Grzeschik <m.grzeschik@pengutronix.de>
Cc: davem@davemloft.net
Cc: joe@perches.com
Signed-off-by: NDavid S. Miller <davem@davemloft.net>