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>

drivers/scsi/isci/task.c

@@ -65,6 +65,8 @@
 #include "sata.h"
 #include "task.h"
 #include "scic_sds_request.h"
+#include "scic_controller.h"
+#include "timers.h"
 
 /**
 * isci_task_refuse() - complete the request to the upper layer driver in