nfp: expose device hotplug capability
nfp: expose device hotplug capability

RTE_PCI_DRV_DETACHABLE flag is required to indicate that a device
can be detached during execution.

Signed-off-by: Alejandro Lucero <1ffca3a1926aae782ae3c39a5b308878ba1e5683@netronome.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk