scsi: zfcp: Declare zfcp_sdev_attrs as static

scsi: zfcp: Declare zfcp_sdev_attrs as static

These attributes are now only accessed through the
zfcp_sysfs_sdev_attr_group.

Link: https://lore.kernel.org/r/0791b9149ebfa39e6b8eab093113cd2527dbf3d3.1657122360.git.bblock@linux.ibm.com
Fixes: 2a5d7e4850ca ("scsi: zfcp: Switch to attribute groups")
Reviewed-by: Benjamin Block <bblock@linux.ibm.com>
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: Benjamin Block <bblock@linux.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>