Add aic_scb_timer_start() which will be used in the aic7xxx driver to start the timer on SCBs queued in the untagged SCB queue.
Add aic_scb_timer_start() which will be used in the aic7xxx driver to
start the timer on SCBs queued in the untagged SCB queue.

The core treats timeouts in usecs to satisfy Linux requirements.  Multiply
accordingly.

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