pata_octeon_cf: perform host detach, removal on exit

This driver does not detach and remove its ata_host properly on device
removal. Add the common .remove helper.

Note: I do not know this driver well enough to ensure this is the right
thing to do. Merge this patch with caution.

Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Acked-by: Tejun Heo <tj@kernel.org>
Cc: David Daney <david.daney@cavium.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

drivers/ata/pata_octeon_cf.c

@@ -921,6 +921,7 @@ free_cf_port:
 
 static struct platform_driver octeon_cf_driver = {
 	.probe		= octeon_cf_probe,
+	.remove		= ata_platform_remove_one,
 	.driver		= {
 		.name	= DRV_NAME,
 		.owner	= THIS_MODULE,