scsi: zfcp: Remove orphaned function declarations

scsi: zfcp: Remove orphaned function declarations

drivers/s390/scsi/zfcp_ext.h: zfcp_sg_free_table - only declaration left
after commit 58f3ead54752 ("scsi: zfcp: move SG table helper from aux to fc
and make them static")

drivers/s390/scsi/zfcp_ext.h: zfcp_sg_setup_table - only declaration left
after commit 58f3ead54752 ("scsi: zfcp: move SG table helper from aux to fc
and make them static")

Link: https://lore.kernel.org/r/6854ae03c5c65805f746774eeb0f2869fcd6c397.1603908167.git.bblock@linux.ibm.com
Reviewed-by: Steffen Maier <maier@linux.ibm.com>
Reviewed-by: Benjamin Block <bblock@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Benjamin Block <bblock@linux.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>