euler inclusion
category: bugfix
bugzilla: 5457
CVE: NA

When we check the sata pathway to the root phy, we need to know if the
expander phy has sata device attached. So that we can have the chance to
set the min linkrate for the sata device.
Signed-off-by: NJason Yan <yanaijie@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>