net/i40e: fix raw packet flow director

net/i40e: fix raw packet flow director

When user configured the flow rule with raw packet via command
"flow_director_filter", it would reset all previous fdir input set
flags with "i40e_flow_set_fdir_inset()".

Ignore to configure the flow input set with raw packet rule used.

Fixes: ff04964ea6d5 ("net/i40e: fix flow director for common pctypes")
Cc: stable@dpdk.org
Signed-off-by: Steve Yang <stevex.yang@intel.com>
Acked-by: Beilei Xing <beilei.xing@intel.com>