net/ring: use EAL APIs in PMD specific API

net/ring: use EAL APIs in PMD specific API

When ring PMD created via PMD specific API instead of EAL abstraction
it is missing the virtual device creation done by EAL vdev.

And this makes eth_dev unusable exact same as other PMDs used, because
of some missing fields, like rte_device->name.

Now API calls EAL APIs to create ring PMDs.

Signed-off-by: Ferruh Yigit <ferruh.yigit@intel.com>
Acked-by: Bruce Richardson <bruce.richardson@intel.com>