eth: remove the DLink/Sundance (ST201) driver

Konstantin reports the maintainer's address bounces.
There is no other maintainer and the driver is quite old.
There is a good chance nobody is using this driver any more.
Let's try to remove it completely, we can revert it back in
if someone complains.

Link: https://lore.kernel.org/20240925-bizarre-earwig-from-pluto-1484aa@lemu/


Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Simon Horman <horms@kernel.org>
Acked-by: Denis Kirjanov <dkirjanov@suse.de>
Signed-off-by: David S. Miller <davem@davemloft.net>