net: Move check for multiple vlans to drivers

To allow drivers to handle the features check for multiple tags,
move the check to ndo_features_check().
As no drivers currently handle multiple tagged TSO, introduce
dflt_features_check() and call it if the driver does not have
ndo_features_check().

Signed-off-by: Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
Simple merge

diff --cc drivers/net/ethernet/mellanox/mlx4/en_netdev.c
Simple merge

diff --cc drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c
Simple merge

diff --cc include/linux/if_vlan.h
Simple merge

diff --cc net/core/dev.c
Simple merge