PCI: Add nr_devfns parameter to pci_add_dma_alias()

PCI: Add nr_devfns parameter to pci_add_dma_alias()

BugLink: https://bugs.launchpad.net/bugs/1864488
[ Upstream commit 09298542cd891b43778db1f65aa3613aa5a562eb ]

Add a "nr_devfns" parameter to pci_add_dma_alias() so it can be used to
create DMA aliases for a range of devfns.

[bhelgaas: incorporate nr_devfns fix from James, update
quirk_pex_vca_alias() and setup_aliases()]
Signed-off-by: James Sewart <jamessewart@arista.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Paolo Pisati <paolo.pisati@canonical.com>