scsi: qedf: Remove unused declaration

This declaration was never implemented, remove it.

Signed-off-by: Yue Haibing <yuehaibing@huawei.com>
Link: https://lore.kernel.org/r/20230822143338.19120-1-yuehaibing@huawei.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

Author: Yue Haibing

drivers/scsi/qedf/qedf.h

@@ -548,7 +548,6 @@ extern void qedf_get_generic_tlv_data(void *dev, struct qed_generic_tlvs *data);
 extern void qedf_wq_grcdump(struct work_struct *work);
 void qedf_stag_change_work(struct work_struct *work);
 void qedf_ctx_soft_reset(struct fc_lport *lport);
-extern void qedf_board_disable_work(struct work_struct *work);
 extern void qedf_schedule_hw_err_handler(void *dev,
 		enum qed_hw_err_type err_type);