scsi: core: Move autosuspend timer delay to Scsi_Host

The runtime suspend timer delay is a const value in scsi_host_template
which a host driver cannot modify at runtime.  Move the delay to Scsi_Host
to allow a driver to update it.

Signed-off-by: Peter Wang <peter.wang@mediatek.com>
Link: https://lore.kernel.org/r/20240109124015.31359-2-peter.wang@mediatek.com


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