Revert "helper : Fix UDP checksum computation"
Revert "helper : Fix UDP checksum computation"

This reverts commit 0043ff8f7dd86a0c1e143412ceb5a14c8ae9c727.
Validation helper test fails. Revert root cause commit.

Signed-off-by: Maxim Uvarov <db4d16e02ae2d7493db430203537da8b2e34f290@linaro.org>

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