net/mlx5: remove extra check on Rx
net/mlx5: remove extra check on Rx

Removing this check improves performance as VLAN and CRC stripping are
enabled most of the time.

Convert MLX5_CQE_VLAN_STRIPPED to network order to speed up the check
instead of doing it on the completion queue entry field.

Signed-off-by: Nelio Laranjeiro <2f8dd9032d5b85ca4b53dec8ce664eb6998836be@6wind.com>
Acked-by: Adrien Mazarguil <9d39ea493ca46c560334f650ac5d4b5ffbcb5cf0@6wind.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk