The attached patch fixes a long standing detection problem with the
sis900 driver.
This PHY chip is used on some Pentium 4  with SiS chipset and on the
Acer Aspire 1705SMi (at least) notebook.
Signed-Off-By: Daniele Venzano <webvenza@libero.it>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>