scsi: isci: remote_node_context: Fix one function header and demote a couple more

Fixes the following W=1 kernel build warning(s):

 drivers/scsi/isci/remote_node_context.c:77: warning: Cannot understand  *
 drivers/scsi/isci/remote_node_context.c:167: warning: Cannot understand  *
 drivers/scsi/isci/remote_node_context.c:206: warning: Cannot understand  *

Link: https://lore.kernel.org/r/20210317091230.2912389-25-lee.jones@linaro.org


Cc: Artur Paszkiewicz <artur.paszkiewicz@intel.com>
Cc: "James E.J. Bottomley" <jejb@linux.ibm.com>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: linux-scsi@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>