net/mlx5: Introduce new uplink destination type

The uplink destination type should be used in rules to steer the
packet to the uplink when the device is in steering based LAG mode.

Signed-off-by: Maor Gottlieb <maorg@nvidia.com>
Reviewed-by: Mark Bloch <mbloch@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>