isci: Termination handling cleanup, added termination timeouts.

Added a request "dead" state for use when a termination wait times-out.

isci_terminate_pending_requests now detaches the device's pending list
and terminates each entry on the detached list.

Signed-off-by: Jeff Skirvin <jeffrey.d.skirvin@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
diff --git a/drivers/scsi/isci/request.h b/drivers/scsi/isci/request.h
index 166295e..b45c0f1 100644
--- a/drivers/scsi/isci/request.h
+++ b/drivers/scsi/isci/request.h
@@ -71,7 +71,8 @@
 	completed   = 0x03,
 	aborting    = 0x04,
 	aborted     = 0x05,
-	terminating = 0x06
+	terminating = 0x06,
+	dead        = 0x07
 };
 
 enum task_type {