ethdev: fix device capability to string translation

ethdev: fix device capability to string translation

Add support for RTE_ETH_DEV_CAPA_FLOW_{RULE,SHARED_OBJECT}_KEEP
to rte_eth_dev_capability_name(), missed when adding the capabilities.

Fixes: 1d5a3d68c0f9 ("ethdev: add capability to keep flow rules on restart")
Fixes: 2c9cd45de7e6 ("ethdev: add capability to keep shared objects on restart")
Reported-by: Ali Alnubani <alialnu@nvidia.com>
Signed-off-by: Dmitry Kozlyuk <dkozlyuk@nvidia.com>
Acked-by: Xueming Li <xuemingl@nvidia.com>
Tested-by: Ali Alnubani <alialnu@nvidia.com>
Reviewed-by: Ferruh Yigit <ferruh.yigit@intel.com>