Use irq_tok() instead of num_tok() for IRQ's.  This will allow us to use the '?' (undefined) token for stating IRQ's in the driver config line.
Use irq_tok() instead of num_tok() for IRQ's.  This will allow us to use
the '?' (undefined) token for stating IRQ's in the driver config line.

This will allow the card to automatically select and unused IRQ when
that code is enabled.

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