scsi: core: Remove obsoleted declaration for scsi_driverbyte_string()

scsi_driverbyte_string() has been unused since commit 54c29086 ("scsi:
core: Drop the now obsolete driver_byte definitions"). Remove it.

Signed-off-by: Gaosheng Cui <cuigaosheng1@huawei.com>
Link: https://lore.kernel.org/r/20240826032005.4007834-1-cuigaosheng1@huawei.com


Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>