performance: pktio_perf: use odp_time_wait_ns() function instead of looping
performance: pktio_perf: use odp_time_wait_ns() function instead of looping

Now odp_time_wait_ns() can be used instead of own implementation.

Signed-off-by: Ivan Khoronzhuk <15ad2a232c436ab54d1b78ef06a09c4cd03911f0@linaro.org>
Tested-by: Mike Holmes <ed44c09f4d7f698f5510adc894a872c73e08c8bd@linaro.org>
Signed-off-by: Maxim Uvarov <db4d16e02ae2d7493db430203537da8b2e34f290@linaro.org>

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