virtio: Move PCI transport to pci-legacy

To make space for the more recent virtio version, move the legacy bits of
virtio-pci to a different file.

Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
Link: https://lore.kernel.org/r/20220701142434.75170-8-jean-philippe.brucker@arm.com
Signed-off-by: Will Deacon <will@kernel.org>
4 files changed