The workaround for Tx tunnel offloading can now be replaced with packet
type flag checking.
The ol_flags for IPv4/IPv6 and tunnel Rx offloading are replaced with
packet type flags.
Signed-off-by: Thomas Monjalon <thomas.monjalon@6wind.com> Acked-by: Adrien Mazarguil <adrien.mazarguil@6wind.com>