linux-generic: pktio loop: implement statistics counters
linux-generic: pktio loop: implement statistics counters

Signed-off-by: Maxim Uvarov <db4d16e02ae2d7493db430203537da8b2e34f290@linaro.org>
Reviewed-and-tested-by: Stuart Haslam <1fce01f364ef5298e64e07a42e08efeef153fa98@linaro.org>

mike-holmes-linaro/odp,nmorey/odp,mike-holmes-linaro/odp,nmorey/odp,ravineet-singh/odp,dkrot/odp,rsalveti/odp,ravineet-singh/odp,ravineet-singh/odp,rsalveti/odp,erachmi/odp,dkrot/odp,dkrot/odp,erachmi/odp,nmorey/odp,rsalveti/odp,rsalveti/odp,rsalveti/odp,erachmi/odp,ravineet-singh/odp,nmorey/odp,mike-holmes-linaro/odp,erachmi/odp,mike-holmes-linaro/odp,dkrot/odp