sis900 adm7001 PHY support

this patch is required to get a SIS964 based motherboard ethernet working
(FSC D1875) (picking the #1 transceiver, instead of the last one, in case
no known ones were found might be a better default, and would have worked
in this case too)

Signed-off-by: Artur Skawina <art_k@o2.pl>
Signed-off-by: Adrian Bunk <bunk@stusta.de>