Commit 7fc8d918 removed code from
eepro100.c and replaced it by different code: the code in net.c
returns bits 31...26, but eepro100 needs bits 7...2.

This patch partially reverts 7fc8d918.
To avoid future problems, I renamed the function and changed the comment.
Signed-off-by: NStefan Weil <sw@weilnetz.de>
Acked-by: NJason Wang <jasowang@redhat.com>
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>