pci: fix igb_uio mapping for virtio_uio and vmxnet3_uio

pci: fix igb_uio mapping for virtio_uio and vmxnet3_uio

Since commit 10ed994 (pci: use igb_uio mapping only when needed),
the flag RTE_PCI_DRV_NEED_IGB_UIO must be set even if RTE_EAL_UNBIND_PORTS
is disabled.
It was not the case for virtio_uio and vmxnet3_uio so the uio resources were
not mapped when RTE_EAL_UNBIND_PORTS was not defined.
Specifically, pci_uio_map_resource() was not called so
pci_dev->mem_resource was not mapped.

Signed-off-by: Daniel Kan <dan@nyansa.com>
Signed-off-by: Thomas Monjalon <thomas.monjalon@6wind.com>