libata: drop @finish_qc from ata_qc_complete_multiple()

ata_qc_complete_multiple() took @finish_qc and called it on every qc
before completing it.  This was to give opportunity to update TF cache
before ata_qc_complete() tries to fill result_tf.  Now that result TF
is a separate operation, this is no longer necessary.

Update sata_sil24, which was the only user of this mechanism, such
that it implements its own ops->qc_fill_rtf() and drop @finish_qc from
ata_qc_complete_multiple().

Signed-off-by: Tejun Heo <htejun@gmail.com>
diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index 3071a23..1389c64 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -1696,7 +1696,7 @@
 	else
 		qc_active = readl(port_mmio + PORT_CMD_ISSUE);
 
-	rc = ata_qc_complete_multiple(ap, qc_active, NULL);
+	rc = ata_qc_complete_multiple(ap, qc_active);
 
 	/* while resetting, invalid completions are expected */
 	if (unlikely(rc < 0 && !resetting)) {