libata: make gtf_filter per-dev

Add ->gtf_filter to ata_device and set it to ata_acpi_gtf_filter when
initializing ata_link.  This is to allow quirks which apply different
gtf filters.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 0ddaf43..b525a09 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -5591,6 +5591,9 @@
 
 		dev->link = link;
 		dev->devno = dev - link->device;
+#ifdef CONFIG_ATA_ACPI
+		dev->gtf_filter = ata_acpi_gtf_filter;
+#endif
 		ata_dev_init(dev);
 	}
 }