net/iavf: support GTPU outer and inner co-exist

net/iavf: support GTPU outer and inner co-exist

Although currently only the gtpu inner hash be enabled while not the
gtpu outer hash, but the outer protocol still needed to co-exist with
inner protocol when configure the gtpu inner hash rule, that would
allow the gtpu inner hash support for the different outer protocols.

Signed-off-by: Jeff Guo <jia.guo@intel.com>
Acked-by: Qi Zhang <qi.z.zhang@intel.com>