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/remote_node_table.c

@@ -60,7 +60,6 @@
  *
  */
 #include "sci_util.h"
-#include "sci_environment.h"
 #include "remote_node_table.h"
 #include "remote_node_context.h"