scsi: isci: phy: Provide function name and demote non-conforming header

scsi: isci: phy: Provide function name and demote non-conforming header

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

 drivers/scsi/isci/phy.c:354: warning: Function parameter or member 'iphy' not described in 'phy_get_non_dummy_port'
 drivers/scsi/isci/phy.c:354: warning: expecting prototype for If the phy is(). Prototype was for phy_get_non_dummy_port() instead
 drivers/scsi/isci/phy.c:371: warning: Function parameter or member 'iphy' not described in 'sci_phy_set_port'
 drivers/scsi/isci/phy.c:371: warning: Function parameter or member 'iport' not described in 'sci_phy_set_port'

Link: https://lore.kernel.org/r/20210317091230.2912389-20-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>