scsi: hisi_sas: fix phy8 linkrate calculation in phy_up_v2_hw()

In function phy_up_v2_hw(), we needlessly recalculate the phy linkrate
for all phys, and the calculation is incorrect for phy8, so remove this
code.
Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Xiang Chen <chenxiang66@hisilicon.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/hisi_sas/hisi_sas_v2_hw.c

@@ -1876,9 +1876,6 @@ static int phy_up_v2_hw(int phy_no, struct hisi_hba *hisi_hba)
 		frame_rcvd[i] = __swab32(idaf);
 	}
 
-	/* Get the linkrates */
-	link_rate = hisi_sas_read32(hisi_hba, PHY_CONN_RATE);
-	link_rate = (link_rate >> (phy_no * 4)) & 0xf;
 	sas_phy->linkrate = link_rate;
 	hard_phy_linkrate = hisi_sas_phy_read32(hisi_hba, phy_no,
 						HARD_PHY_LINKRATE);