isci: Redesign device suspension, abort, cleanup.

This commit changes the means by which outstanding I/Os are handled
for cleanup.
The likelihood is that this commit will be broken into smaller pieces,
however that will be a later revision.  Among the changes:

- All completion structures have been removed from the tmf and
abort paths.
- Now using one completed I/O list, with the I/O completed in host bit being
used to select error or normal callback paths.

Signed-off-by: Jeff Skirvin <jeffrey.d.skirvin@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

drivers/scsi/isci/init.c

@@ -556,7 +556,6 @@ static struct isci_host *isci_host_alloc(struct pci_dev *pdev, int id)
 	}
 
 	INIT_LIST_HEAD(&ihost->requests_to_complete);
-	INIT_LIST_HEAD(&ihost->requests_to_errorback);
 	for (i = 0; i < SCI_MAX_PORTS; i++) {
 		struct isci_port *iport = &ihost->ports[i];