isci: unify constants

cross driver constants are spread out over multiple header files, consolidate
them into isci.h, and push some includes out to the source files that need
them.

TODO: remove SCI_MODE_SIZE infrastructure.
TODO: task.h is full of inlines that are too large

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
diff --git a/drivers/scsi/isci/port.h b/drivers/scsi/isci/port.h
index 3550345..59505cb 100644
--- a/drivers/scsi/isci/port.h
+++ b/drivers/scsi/isci/port.h
@@ -55,6 +55,9 @@
 
 #ifndef _ISCI_PORT_H_
 #define _ISCI_PORT_H_
+
+#include <scsi/libsas.h>
+#include "isci.h"
 #include "scic_sds_port.h"
 
 struct isci_phy;