[SCSI] zfcp: Small QDIO cleanups

QBUFF_PER_PAGE is only used inside the qdio module, so move it to
zfcp_qdio.c

zfcp_qdio_zero_sbals is now only used in the qdio module, so make it
static.

Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: Swen Schillig <swen@vnet.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

drivers/s390/scsi/zfcp_ext.h

@@ -43,7 +43,6 @@ extern void _zfcp_scan_ports_later(struct work_struct *work);
 /******************************* S/390 IO ************************************/
 extern int  zfcp_ccw_register(void);
 
-extern void zfcp_qdio_zero_sbals(struct qdio_buffer **, int, int);
 extern int  zfcp_qdio_allocate(struct zfcp_adapter *);
 extern void zfcp_qdio_free(struct zfcp_adapter *);
 extern int  zfcp_qdio_send(struct zfcp_fsf_req *fsf_req);