isci: move core/controller to host

Now that the data structures are unified unify the implementation in
host.[ch] and cleanup namespace pollution.

Reported-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

drivers/scsi/isci/task.c

@@ -65,7 +65,6 @@
 #include "sata.h"
 #include "task.h"
 #include "scic_sds_request.h"
-#include "scic_controller.h"
 #include "timers.h"
 
 /**