scsi: message: fusion: Remove unused mptscsih_target_reset()

mptscsih_target_reset() was added in 2023 by commit e6629081 ("scsi:
message: fusion: Correct definitions for mptscsih_dev_reset()") but never
used.

Remove it.

Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
Link: https://lore.kernel.org/r/20250127002716.113641-1-linux@treblig.org


Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>