sata-fsl: Apply link speed limits

The driver was ignoring limits requested by libata.force.  The output
would look like:

fsl-sata ffe18000.sata: Sata FSL Platform/CSB Driver init
ata1: FORCE: PHY spd limit set to 1.5Gbps
ata1: SATA max UDMA/133 irq 74
ata1: Signature Update detected @ 0 msecs
ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 310)

Signed-off-by: Martin Hicks <mort@bork.org>
Signed-off-by: Tejun Heo <tj@kernel.org>

drivers/ata/sata_fsl.c

@@ -869,6 +869,8 @@ try_offline_again:
 	 */
 	ata_msleep(ap, 1);
 
+	sata_set_spd(link);
+
 	/*
 	 * Now, bring the host controller online again, this can take time
 	 * as PHY reset and communication establishment, 1st D2H FIS and