isci: move remote_device handling out of the core

Now that the core/lldd remote_device data structures are nominally unified
merge the corresponding sources into the top-level directory.  Also move the
remote_node_context infrastructure which has no analog at the lldd level.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>

drivers/scsi/isci/probe_roms.c

@@ -33,7 +33,6 @@
 #include "isci.h"
 #include "task.h"
 #include "sci_controller_constants.h"
-#include "scic_remote_device.h"
 #include "sci_environment.h"
 #include "probe_roms.h"