net: tulip: update MAINTAINER status to Orphan

I haven't had any PCI tulip HW for the past ~5 years. I have
been reviewing tulip patches and can continue doing that.

Signed-off-by: Grant Grundler <grundler@parisc-linux.org>
Acked-by: Helge Deller <deller@gmx.de>
Signed-off-by: David S. Miller <davem@davemloft.net>