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/host.c b/drivers/scsi/isci/host.c
index 271a7e1..5847149 100644
--- a/drivers/scsi/isci/host.c
+++ b/drivers/scsi/isci/host.c
@@ -60,7 +60,9 @@
 #include "request.h"
 #include "host.h"
 #include "probe_roms.h"
+#include "scic_controller.h"
 #include "scic_sds_controller.h"
+#include "timers.h"
 
 irqreturn_t isci_msix_isr(int vec, void *data)
 {