pci: use igb_uio mapping only when needed

pci: use igb_uio mapping only when needed

Since DPDK 1.4, if RTE_EAL_UNBIND_PORTS is disabled, igb_uio mapping is
done for all devices (commit eee16c964cd), breaking some non-Intel drivers.
But pci_uio_map_resource() should only be called for Intel devices
(using igb_uio kernel module).
The flag RTE_PCI_DRV_NEED_IGB_UIO is set for all those devices, even when
RTE_EAL_UNBIND_PORTS is disabled (fixes commit a22f5ce8fcc).

Signed-off-by: David Marchand <david.marchand@6wind.com>
Signed-off-by: Thomas Monjalon <thomas.monjalon@6wind.com>
Acked-by: Damien Millescamps <damien.millescamps@6wind.com>