ethdev: use device name from device structure

ethdev: use device name from device structure

Device name resides in two different locations, in rte_device->name and
in ethernet device private data.

For now, the copy in the ethernet device private data is required for
multi process support, the name is the how secondary process finds about
primary process device.

But in the ethdev library some eth_dev->data->name usage can be
converted to rte_device->name.

This patch updates ethdev to use rte_device->name when possible.

Signed-off-by: Ferruh Yigit <ferruh.yigit@intel.com>