net/i40e: fix jumbo frame flag condition

net/i40e: fix jumbo frame flag condition

The jumbo frame uses the 'RTE_ETHER_MAX_LEN' as boundary condition,
but the Ether overhead is larger than 18 when it supports dual VLAN tags.
That will cause the jumbo flag rx offload is wrong when MTU size is
'RTE_ETHER_MTU'.

This fix will change the boundary condition with 'RTE_ETHER_MTU' and
overhead, that perhaps impacts the cases of the jumbo frame related.

Fixes: c1715402df8f ("i40evf: fix jumbo frame support")
Fixes: 43e5488c0ac6 ("net/i40e: support MTU configuration")
Fixes: a778a1fa2e4e ("i40e: set up and initialize flow director")
Fixes: c3ac7c5b0b8a ("net/i40e: convert to new Rx offloads API")
Cc: stable@dpdk.org
Signed-off-by: Steve Yang <stevex.yang@intel.com>
Acked-by: Jeff Guo <jia.guo@intel.com>