net: stmmac: xgmac: Implement set_mtl_tx_queue_weight()

Implement the TX Queue Weight callback. In order for this to be active
we also need to set ETS algorithm when configuring Queue.

Signed-off-by: Jose Abreu <joabreu@synopsys.com>
Signed-off-by: David S. Miller <davem@davemloft.net>