misc: bcm-vk: Specify the minimum number of IRQ vecs

During bcm_vk_probe(), pci_alloc_irq_vectors() is called passing the
number of IRQ vectors as 1, but, later, check how many IRQ vectors it
got, and fails if it is smaller than VK_MSIX_IRQ_MIN_REQ.

The most appropriated way to do it is setting the 'min_vecs' param as
VK_MSIX_IRQ_MIN_REQ, instead of one. pci_alloc_irq_vectors() should
know the requirements when called.

The test was done by just loading this module on a machine with a
Valkyrie offload engine hardware.

Acked-by: Scott Branden <[email protected]>
Signed-off-by: Breno Leitao <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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