Add support for CONFIG_IRQ_MAP VC message
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Authored by rstone on Jan 24 2015, 10:45 PM.

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jfv

Summary

This message is used by the VF to request that its RX and TX
queues be associated with particular MSI-X vectors. This
configuration is performed via a fairly complicated linked-list
mechanism in the hardware. The linked list is built up backwards
(from the tail to the head) as it turns out to simplify the logic
significantly.