Since the VLAN header is stripped from mbuf data, PKT_RX_VLAN_STRIPPED
should be set in offload flag.
Fixes: 6b59a3bc82b1 ("fm10k: fix VLAN in Rx mbuf")
Fixes: 7092be8437bd ("fm10k: add vector Rx")
Cc: stable@dpdk.org
Signed-off-by: Xiao Wang <xiao.w.wang@intel.com>