Subject: ahci: hotplug polling functions for vt8251 hardware variant

The VT8251 was missed during the previous 3 patches, as it used to be a
seperate branch by Tejun.

diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index adaa82b..c151af8 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -303,6 +303,9 @@ static const struct ata_port_operations ahci_vt8251_ops = {
 	.error_handler		= ahci_vt8251_error_handler,
 	.post_internal_cmd	= ahci_post_internal_cmd,
 
+	.hp_poll_activate	= sata_std_hp_poll_activate,
+	.hp_poll		= sata_std_hp_poll,
+
 	.port_suspend		= ahci_port_suspend,
 	.port_resume		= ahci_port_resume,