net/mlx5e: take into account device reconfiguration for xdp_features flag

Take into account LRO and GRO configuration setting device xdp_features
flag. Consider channel rq_wq_type enabling rx scatter-gatter support in
xdp_features flag and disable NETDEV_XDP_ACT_NDO_XMIT_SG since it is not
supported yet by the driver.
Moreover always enable NETDEV_XDP_ACT_NDO_XMIT as the ndo_xdp_xmit
callback does not require to load a dummy xdp program on the NIC.

Fixes: 66c0e13a

 ("drivers: net: turn on XDP features")
Co-developed-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>