net/i40e: enable per-device packet type mapping

net/i40e: enable per-device packet type mapping

The mapping from hardware defined packet type to software defined
packet type is static for i40e device, the patch let each ethdev to
to have their own copy of mapping table, this give the possibility
that different ethdev can be set different PTYPE mapping rule which
is the requirement to support following hardware's dynamic PTYPE
feature.

Signed-off-by: Qi Zhang <qi.z.zhang@intel.com>
Acked-by: Jianbo Liu <jianbo.liu@linaro.org>
Acked-by: Chao Zhu <chaozhu@linux.vnet.ibm.com>