net/ice/base: clean duplicate in finding GTPU dummy packet
net/ice/base: clean duplicate in finding GTPU dummy packet

Four GTPU tunnel types are used twice to find GTPU dummy packets
(ipv4_gtpu_ipv4/ipv6, ipv6_gtpu_ipv4/ipv6). Clean redundant code.

Signed-off-by: Yuying Zhang <a05fb630652fa1cf5d650979450888a135e9aae3@intel.com>
Acked-by: Qi Zhang <9e9e58ffa71a29bb7b87766b362515be648fcbe0@intel.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk