net/i40e: fix L4 checksum flag

net/i40e: fix L4 checksum flag

When tunneled packet received that inner L4 checksum value is correct,
the test_pmd output log shows 'ol_flags' value is
'PKT_RX_L4_CKSUM_UNKNOWN', but expected value is 'PKT_RX_L4_CKSUM_GOOD'.

If the inner l4 checksum is correct, mark the 'PKT_RX_L4_CKSUM_GOOD'
flag to 'l3_l4e_flags' for sse and 'l3_l4_flags_shuf' for avx2 to
ensure that the 'ol_flags' can match correct flags.

Fixes: 9966a00a0688 ("net/i40e: enable bad checksum flags in vector Rx")
Fixes: dafadd73762e ("net/i40e: add AVX2 Rx function")
Cc: stable@dpdk.org
Signed-off-by: Murphy Yang <murphyx.yang@intel.com>
Acked-by: Jeff Guo <jia.guo@intel.com>