Add helper function is_sata_phy_v2_hw() to judge whether the attached
device is SATA disk for a root PHY.
Signed-off-by: Xiaofei Tan <tanxiaofei@huawei.com>
Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>