PCI: Add pci_irq_vector() and other stubs when !CONFIG_PCI

PCI: Add pci_irq_vector() and other stubs when !CONFIG_PCI

Add stub functions pci_alloc_irq_vectors_affinity() and pci_irq_vector()
when CONFIG_PCI is off so drivers can use them without resorting to ifdefs.

Also move the PCI_IRQ_* macros outside of the ifdefs so they are always
available.

Fixes: 625f269a5a7a ("crypto: inside-secure - add support for PCI based FPGA development board")
Link: https://lore.kernel.org/r/20190904122600.GA28660@gondor.apana.org.au
Reported-by: kbuild test robot <lkp@intel.com>
Reported-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>