ethdev: support runtime queue setup

ethdev: support runtime queue setup

It's not possible to setup a queue when the port is started
because of a check in ethdev layer. New capability flags are
added in order to relax this check for devices which support
queue setup in runtime. The functions rte_eth_[rx|tx]_queue_setup
will raise an error only if the port is started and runtime setup
of queue is not supported.

Signed-off-by: Qi Zhang <qi.z.zhang@intel.com>
Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
Acked-by: Ferruh Yigit <ferruh.yigit@intel.com>
Acked-by: Thomas Monjalon <thomas@monjalon.net>