scsi: aic7xxx: Remove unused function pointer typedef ahc_bus_suspend/resume_t

Remove the 'ahc_bus_suspend/resume_t' typedef as it is not used.

Link: https://lore.kernel.org/r/1613389249-3409-1-git-send-email-chen45464546@163.com


Signed-off-by: Chen Lin <chen.lin5@zte.com.cn>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>