performance: odp_pktio_perf: fix potential overflow for burst_gap
performance: odp_pktio_perf: fix potential overflow for burst_gap

The direct comparing of "cur_cycles" and "next_tx_cycles" is not
valid, as "next_tx_cycles" can be overflowed and comparison will
give wrong result. So use odp_time_diff_cycles() for that, as it
takes into account ticks overflow.

Signed-off-by: Ivan Khoronzhuk <15ad2a232c436ab54d1b78ef06a09c4cd03911f0@linaro.org>
Reviewed-by: Petri Savolainen <d528fd253b9aaf78fa72edbcc6249e82047f6ce6@nokia.com>
Signed-off-by: Maxim Uvarov <db4d16e02ae2d7493db430203537da8b2e34f290@linaro.org>

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