MAINTAINERS: Update the 3c59x network driver entry

Replace my old E-Mail address with a working one.
While at it, change the maintainance status to
'Odd Fixes'. I'm still around with some knowledge,
but don't actively maintain it anymore.

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: David S. Miller <davem@davemloft.net>