use PCI layer IRQ affinity in lpfc

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This series has two patches: the first is a simple conversion of
lpfc to use pci_alloc_irq_vectors.  The second is more interesting,
and makes use of the PCI_IRQ_AFFINITY option to use the core interrupt
affinity assignment that takes nodes into account and can be easily
queried.  It also ensures we propagate this information to blk-mq
to make sure the block layer queues are properly aligned to the
interrupt vectors.

Note that these patches require core IRQ changes from a stable
branch in the tip tree to be pulled in first:

	git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git irq/for-block

Also be aware that I don't have any lpfc hardware to actually test these.
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